Corn Sourdough with wild yeasts and S.bayanus


Come try this tasty bread at our event this Monday, January 27th, 7 to 9:00. We still have 9 seats left! Eventbrite (Register at this link, or at MeetUp for cash donations). With Chris Cuzme and Mary Izett that create their brews at Fifth Hammer Brewing Company in Long Island City, where the event is taking place. And try some things that we made using enzymes, and yeasts starters.

We typically have an ongoing sourdough starter that we feed at least once a day. We never throw out any of it because we have so many uses for it. It’s fermented dough.

We typically feed the starter based on the formula described below. If you are taking it out of the fridge where it has been stored for a while, you have to feed it at least 3 or four times before it will be active enough to raise your dough. That means at least 24 hours.

First, put the recently used starter into a clean jar and add the water. 75F degree water is best. Not hotter. Mix it very well. Then add the flour and mix. Cover tighly or not.

Keeping it at 72F to 85F is best unless you want to grow it more slowly. It typically takes about 3 hours to become active after each feeding. It should at least double in size. The most common failure to rise issue is that the starter is not active enough. Same with brewing.



  • 40 grams sourdough starter from a recent previous batch
  • 70 grams strong bread flour
  • 70 grams water at 75F

After you have started the process of getting your starter active, mix the flour and water that you are going to use for the bread. We like to let it sit, covered, in a warm spot for at least three hours as well.

We highly recommend you do this step. If you want you can mix your flour and water then refrigerate and bring to room temperature the next day. Or even several days later. This is called autolyze, a part of starch hydrolization that is very similar to the process called gelatinization.

  • 700 grams bread flour
  • 450 grams water


  • 640 grams corn biga with S. bayanus yeast
  • 140 grams active starter
  • 36 grams shio-koji (if omitted, use coarse sea salt as specified below)

A biga is made by mixing flour and water together with a small amount of yeast. It is then refrigerated overnight or longer. We used corn bran and rice bran for this biga.

The yeast we used was S.bayanus. This yeast is typically made for wine and beer brewing. You could use another yeast if you like.

We mix the biga and the sourdougb starter together very well, turning it onto itself in a bowl for several minutes.

We then took the mix of water and flour from several hours earlier and mixed that into the biga and sourdough starter mix. We did this while adding the shio koji.

We aimed for 2% salt in this bread, based on bakers percentages. That means that we added up all the flour we used including the flour that was used in the sourdough starter and the biga.

The total flour amount was 1100 grams. That means we needed 22 grams of salt or 170 grams of aged, salty shio-koji. We added 148 grams more of shio koji to the mix after we rested it for 30 minutes.

We kneaded dough, several times while letting it rise again. Finally, we put one half in the fridge to test the yeast – and the other half in a large loaf pan. It was lft to rise for 120 minutes.


9 AM
11 AM

Bake at 450 for 30 to 45 minutes. Remove from oven and let cool for at least 2 hours.

We already have some great ideas for some other yeasts. All baked goods should have one form of filamentous fungus (Aspergillus, Rhizopus, etc.) or bacterial enzymes or both in them. We already have some great ideas for some other yeasts.



Coconut Fennel Beer


Roasted Sourdough Coconut Fennel Bread in a rich malt broth.

Eventbrite (Register at this link, or at MeetUp for cash donations)

January 27th, 7 to 9:30 come ask questions about any of the recipes or methods used in this post. Two extremely skilled fermenters, and cutting edge brewers, Chris Cuzme and Mary Izett will be in house helping us answer questions.

They create their brews at Fifth Hammer Brewing Company in Long Island City, where the event is taking place. Take a look at their menu! And try some things that we made using enzymes, and yeasts starters. We’ll answer any question that you have about anything fermented.


We used lots of different types of grains inoculated with koji. We made syrups out of them by making amasake from both rice and barley inoculated with Aspergillus oryzae (koji), then slowly boiled them down to a very thick sweet paste.

You could use store bought barley malt or rice syrup.

We also added some DME, or direct malt extract, to the broth or what is called the mash if you are making beer. You could use all powdered DME if the syrups are too time consuming or expensive.


Sweet Malted Wort meets Toasted Coconut Fennel Sourdough Bread

Our yeasts were from what are sometimes called Shanghai yeast balls. These typically contain koji as well as other fungal enzymes like the ones you can make tempeh with called Rhizopus oryzae.

These enzymes work to break down big starches into small digestible sugars for humans, and for yeast food. When starches are broken down like this they are then called fermentable sugars. The yeast can eat them and create alcohol and gas.


Yeasts balls crushed up, and a fancy instrument to measure the SG of your beverage. This is important when you want to know how much alcohol something contains. Not much at all at the start – or at the end.

Chinese yeast balls called 麹 in traditional Chinese also contain specific bacteria that are widely used in the food sector to turn starches into sugars, including for fermenting. The Japanese recognize the word 麹 as meaning koji as well.

But the Japanese got their alphabet (or kanji) from the Chinese. It’s a system of pictograms. The Japanese dramatically altered both the language and the koji so that now most people refer to koji as the purified, Aspergillus only Japanese version.

Chinese starter cultures are dramaticaly different, but do often contain some Aspergilllus oryzae as well. It can be confusing when 麹 is used. All the great spore producers are in Japan.


The original koji mash we boiled.

We wanted to introduce people to the concept of mashing, above, as well as adding house made or store made malt extracts in powder or liquid form.

If you have enough you won’t even need the powdered malt extract. On the other hand, you could double the dried malt extract and skip the koji syrups. (original recipe)


The yeast forming a nice top of the beer. This beer doesn’t have hops, though. So this is really, really old school.

After straining the liquid we had intended to use for something else we realized we had lots of liquid koji extracts in the refrigerator. We also had lots of sourdough bread that had some flavoring components in them. Those became this spiced beer.

  • 6000 grams liquid cooled down to 95 to 105F
  • 950 grams heavily toasted sourdough bread (coconut and fennel sourdough bread was used in this recipe)
  • 22 grams crushed yeast balls (2 to 3 balls)

When the malted liquid made from either koji syrups or liquid or powdered malt – your goal is a starting SD of 1.040, but don’t worry about it if you can’t measure it – is below 105F, pour over the sourdough and let it absorb the liquid. Keep warm.

After about an hour the bread should have absorbed the liquid and be around 95F. As long as it’s between 72F to 95F it’s okay. Add the crushed up yeast balls and stir for about 5 minutes.

Cover with a towel and leave in a warm place for about an hour. Stir well again and put in a sanitized container. It should not fill the container more than half full. Put in warm area, maintaining a temperature as close to 82F as you can, covered with an air lock or just a sanitized cloth. Stir once or twice a day for 3 days, tasting as you go along.

At day 3 strain the mixture well with a sanitized strainer. Put in smaller sanitized container and let it settle for a few hours. Then pour off the top liquid into sanitized bottles and let sit again, this time in a cool area.

Either pour off the liquid again after about 12 hours – rack it some more while pouring the liquid through a very fine nut bag or brewing bag – or don’t and refrigerate until very cold.

Leave about an inch space in each bottle, then seal the bottles tightly. Be aware of carbon dioxide buildup. Burp the bottles if they appear to be building up gas.

Careful when taking the bottles from a very cold refrigerator to a warmer area. As with water kefir and milk kefir, open bottles with a towel over a bucket if necessary.



Ask questions at our upcoming event! There are two ways to register depending on whether you have cash or credit. Most people are registering using Eventbrite, but register at our MeetUp page if you have cash or can’t afford anything. Just register.


Part 2 of the Chocolate Brew

Eventbrite (Register at this link, or at MeetUp for cash donations)

January 27th, 7 to 9:30 come ask questions about any of the recipes or methods used in this post.

Two extremely skilled fermenters, and cutting edge brewers, Chris Cuzme and Mary Izett will present and answer questions. They create their brews at Fifth Hammer Brewing Company in Long Island City, where the event is taking place. Take a look at their menu!

Try some things that we made using enzymes, and yeasts starters. We’ll answer any question that you have about anything fermented.


The following recipes demonstrate methods that are useful across the board for anything you brew. Yeast is involved, as are bacteria.

We measure the starting SG (specific gravity) and PH of everything. We count on bacteria to create lactic acid to lower the PH in some brews, but not this one.

We could easily just add some lactic acid up front to lower the PH quickly to protect the yeast from infection in any brew, but that does not avoid the need to always be sanitary. Even when you have an open brewing system like with sake.

Once the yeast takes hold it will be able to control the environment of the brew, but in many cases unless the lactic acid producing bacteria are prevented from infecting the moromi or mash, the yeast may not stand a chance.


Utensils hanging out in Star-san. You can even save it for bottle washing weeks later.

We’ll talk about sanitation in future posts. For now wash everything, use gloves, and boil everything that could come in contact with your brew.

Everything always follows strict rules of sanitation. Get some Star-san and use it. You could also use bleach, but that’s a lot more tricky.


Rice sugar extract, similar to a liquid malt extract.

We wanted to introduce people to the concept of mashing, as well as adding house made or store made malt extracts in powder or liquid form.

Obviously introducing people to some basic principles of yeast starter building and maintenance for everything from sake to shoyu to beer if they haven’t been introduced is always a good thing.

We’ll discuss all these things at the event, and in future posts after the event.


Chocolate Koji Kvass (濁酒)- continued
  • 3785 grams (1 gallon) water
  • 1400 grams rice koji syrup (warm)
  • 445 grams barley koji syrup (warm)
  • 240 grams dried powdered barley malt extract

After straining the liquid we realized we had lots of liquid koji extracts in the refrigerator. We also had lots of sourdough bread that had some flavoring components in them. So we set the liquid we made in the previous post – our sweet little wort – and decided to make a more refined base for our Chocolate Koji Doboroku.

We boiled these together in a sanitized pot being careful not to scorch or burn the bottom.

  • 85 grams bittersweet chocolate

We added the chocolate right near the end of the boil of 60 minutes and mixed it well with a sanitized whisk. At the 50 minute mark is fine.


The cooling down wort waiting for it’s yeast.

When the boil got down to 90 F we added the yeast and stirred. You can use an ice bath and cold water to get the temperature down.

Proofed S.bayanus yeast ready to go.

After that, we put a sanitized lock top lid on top. We waited a week or so until we sampled it. Keep it at 72F or below if you can.

We may add some additional chocolate at this point similar to an infused sake. If you plan on doing that hold back some chocolate and let it steep in a small amount of alcohol or water in the fridge. Come try some.


Maple Syrup and Smoked Pomegranate Kvass


Organic beets. Do not discard the greens, including the stems.Do not discard anything you trim off, unless it is not organically grown. You only need the actual beet bottoms for these recipes, though.

Come and ask questions of two extremely skilled fermenters and cutting edge brewers, Chris Cuzme and Mary Izett. They create their brews at Fifth Hammer Brewing Company in Long Island City, where the event is taking place. Take a look at the menu!

The Event is January 27th, 7 to 9:30 Come ask questions about any of the recipes or methods used in this post about beets. Try some things that we made using enzymes, and yeasts starters. We’ll answer any question that you have about anything fermented. Plus, this is a #vegan event.


Pomegranate powder about to be incorporated into a smoky maple syrup and fennel seed beet base for a great probiotic drink. And for cockatils as well. Got shochu?

Smoked Maple and Pomegranate Beet Kvass

  • 425 grams washed and diced raw organic beets
  • 1250 grams of water (enough to cover the beets in a half gallon jar)
  • 1 to 2 tsp toasted fennel seeds
  • 30 grams coarse sea salt. Do not use fine sea salt for this. Kosher salt is okay.
  • 4 TB maple syrup
  • 4 TB pomegranate powder (or just add more maple syrup or molasses)
  • 1/8 tsp liquid smoke or ash. Do not use more. Add more when finished if you like.
  • 2 TB unpasteurized vinegar (apple cider vinegar with the mother, etc.)
  • 4 TB Pomegranate Molasses (or more maple syrup)
  • 1/2 cup sugar (organic, any type. If replacing maple syrup and pomegranate with dark molasses, use 1/2 cup more)

Mix everything together in a large bowl with gloved hands or a spoon. Otherwise, your hands will get stained. If you can’t get pomegranate powder or molasses use more maple syrup as indicated. You can also use organic dark brown sugar or organic molasses. The fennel seeds are essential, but can be replaced with anise seeds.

Other natural smoke flavorings or even smoked soy sauce or smoked salt can be used, sparingly. Smoked salt does not replace the coarse sea salt. Add some smoked salt to your kvass before serving if you like.

Ferment in an area where it is between 72 and 85F. It should take a week to ten days. If the temperature is lower, it will take at least 14 days before it is ready.


Put baby in the corner.


Shiso Leaf and Beet Kvass with pickled beets
  • 216 grams ( about 3 medium sized beets) raw organic beets. If not organic peel them. Otherwise after cutting into thick matchsticks wash them in cold water by rubbing them gently.
  • 1500 grams warm water. This will cover the beets that are placed in a well washed and sanitized half gallon glass jar.
  • 190 grams Shiso Vinegar*. Our Shiso vinegar has enough salt in it to act both as a starter culture, and as a deterrent to unwanted bacteria and yeasts. The base is an apple cider vinegar with lots of the mother in it. There are both yeasts and bacteria in vinegar.

Cover the jar tightly and shake. You could also dump the content of the jar into a bowl and mix them well. Then, put them back into the jar and cover with an airlock, or a tight lid. To be safe put the jar in a bowl or dish. If it looks like air is building up in your jar, loosen it to let it escape then retighten it.

This should be done in 5 to 7 days, but can go for two or three weeks if you like. Save the beets for a fantastic beet, pickle and apple salad. Or dress them with a miso dressing as a side dish. You can also start a new batch using the liquid if you like as a starter culture.

*Perilla vinegar substitute – You can use unpasteurized apple cider vinegar and mix in some umeboshi vinegar (about 1/4 cup), or use some shiso furikake (check the ingredients if you are a vegan) with vinegar and salt. You could also use vinegar, 3 TB of coarse sea salt and fresh dill or toasted dill seeds, or roasted black peppercorns.

The perilla vinegar could also be replaced with 40 grams of coarse sea salt. If you know beforehand then cut the beets thinner or into smaller pieces. Either way it should taste just a little salty at first, but not extremely salty.

Only salt will take about 2 weeks, but check it as you go along. Don’t stick unclean spoons, forks or fingers in your ferments.


Chocolate Koji Kvass (濁酒)


Heavily toasted rice koji (A.oryzae) sourdough bread.

Recipe
  • 150 grams rice koji
  • 200 grams wheat berry or brown rice koji (or more rice koji)
  • 300 grams heavily toasted cubed or ripped apart sourdough bread.

Mix above ingredients and toast slowly in oven for two hours at 200F. Stir occasionally. Not burnt, but really brown for the bread. The koji won’t change color much but will smell amazing.

The rice koji bread above is obviously not as dark as a pumpernickel bread would be. Bread made with rice or another koji is preferred, but use whatever leftover bread you have.

Use whatever koji you have. Can’t get your hands on koji? Use malt extracts. We’ll discuss those tomorrow.


Two hours after slow roasting our kojis and bread.

  • 24 cups boiled water, cooled down to 140F

Pour the water onto the mixture hanging over your fermenter in a brew bag. Stir the contents in the bag well.

Let sit, covered with a sanitized cloth or plastic wrap for 24 hours as close to 120F as you can.

It’s okay if you can only keep the temperature at 72F.


In the sanitized brew bag. In a fermenter (a plastic, food safe bucket that fits right into our cooler) that can easily be chilled.

We’ll decide what to do for yeast once you lift the brewers bag out carefully letting every last drop drip out. Don’t squeeze the bag, though. Save the dregs to make vinegar or compost it.

You can also dry it out and use as breading for fried foods or as a thickening agent.

You should have either brewers yeast, yeast balls, champagne yeast, sake yeast or even another type of yeast for tomorrow.


Ask questions at our upcoming event! There are two ways to register depending on whether you have cash or credit. Register here if you want to bring cash or make donations. If you want to register with a credit card use the Eventbrite link.


Let’s Get Startered

Yeast starters and starter cultures that contain yeast – like the original koji for which the Chinese Kanji (麹) was created – sometimes also contain other types of bacteria, fungus and even other yeasts.

Take, for example, sourdough starter. It’s easy to turn that into vinegar because there are already some bacteria and yeasts in there just like there are in kombucha.

Eventually, often with the help of wild yeasts and bacteria, both of these will eventually become alcohol. Vinegar is made from alcohol, either fermented fruits like apples or peaches, or from grains.

But controlling how much yeast, and especially what kinds of yeast get into a specific starter is how most alcoholic and non-alcoholic fermentations are successfully made.

It’s essential that any utensils and containers you use are very clean. Always kill off as many wild strains that may be lurking before starting or proceeding – unless these are part of your fermenting culture.

Sometimes rinsing everything with boiling water is enough. Other times it is woefully inadequate. Equally important is making sure ever ingredient is properly prepared.

Soaking tree nuts or beans, for example, helps to remove undesirable substances that can ruin fermentations, or mess up your digestive system.

Some yeasts work remarkably well at protecting crops from diseases. These are benign and helpful yeasts. But even then sometimes these microbes in large amounts actually cause allergies, and what are sometimes mistaken as intolerance to a specific grain or nuts.

So soak your nuts, seeds, grains, and legumes. Some recipes call for salt, vinegar, alcohol or lactic acid to help the process along, but it’s usually about how much salt is involved and how the water or moisture content of ingredients is affected.

Some yeasts can take can take up to a 7% sodium content, so controlling the entire microbiome of the things that you are making is crucial. Some harmful microbes can be eliminated by pre-drying or curing.

Soaking ingredients, along with treatment with enzymes produced by sprouted grains or microbes such as Aspergillus strains or lactobacteria, can also greatly assist in making breads, misos, kefir, and soy or amino sauces more nutritious, digestible, and free from potential residues.


January 27, 2020 – Event at Fifth Hammer

Come and ask questions of two extremely skilled fermenters and cutting edge brewers, Chris Cuzme and Mary Izett. They create their brews at Fifth Hammer Brewing Company in Long Island City.

You’ll also get to try some things that we made using enzymes, and yeasts starters. Plus, we’ll answer any question that you have about anything fermented. Of course it would be great if you had any hard core science related questions posted here, or sent to koji@earthlink.net beforehand so we could have a concise answer for you.

We revised the agenda based on specific requests from people about yeast starters that are useful when making a wide array of things such as beer, miso, soy sauce, meat or fish sauce, sourdough bread, vinegar, sake or kvass.

For example, someone really wanted to know about using a yeast starter for making beer. Although someone knew what sourdough bread kvass was, they asked if a yeast starter could improve it. Kvass made with fresh or old sourdough bread, heavily toasted for flavor and color, can be improved by a yeast starter, and can be flavored not only with wild herbs and roots and dried fruits but also with hops like beer.


Making Kvass

  • 1/2 gallon room temp water, left out overnight, covered, if you are concerned about chlorine or other substances.
  • 4 cups of leftover sourdough starter at room temperature (most people collect it in the fridge or freezer)
  • 1/2 cup Zante currants or other dried fruits such as raisins or cherries
  • 2 cups heavily toasted cubed or ripped apart sourdough bread. Not burnt, but really brown.
Heavily toasted sourdough bread and dried carrots were combined with a yeast starter to make a deep carrot and caramel toast flavored Kvass. Kvass typically is made with dark breads that contain rye, wheat, barley and often dried fruits, but you can use any heavily toasted bread.

Mix all the ingredients above in a well cleaned vessel that is able to take a doubling in volume. Unlikely, but until you’ve had to clean an overactive or over yeasted beverage that didn’t actually explode we recommend not letting it get above 80F.

Do not increase the amount of yeast. Give it space. The mixture will most likely be very thick after about an hour, at which point you will add:

  • 12 cups room temperature water
  • 1 – 2 cups sugar (jaggery, piloncillo, dark brown, organic cane, palm sugar, etc.)
  • 1 tsp brewers yeast, or bread yeast or even unpasteurized kasu (the pressings or dregs) from a recently made sake.

Do not add more yeast unless, at four or five hours at 75F, it appears that nothing is happening. The bread wil most likely have floated up to the top, so once you mix it the yeast will grow. Because yeasts love oxygen. And the bread top may be blocking air flow. Stir.

Always cover loosely with a cloth or several layers of mesh. Do not cover tightly. Strain at 24 to 48 hours if you like the taste. It will becomes a little more sour each day.

Once you strain it – don’t discard anything – put it in bottles and chill. Do not fill the bottles to the top. Do not screw lids on tightly. After a day at 50F or less degrees, you can rack off your strained kvass.

Racking is siphoning off, or pouring off the liquid on the top and leaving the sediment. This is a standard brewing technique and it comes in very handy for a whole range of different things.

Strained kvass being racked and chilled. We added dried carrots to the brew. Very low alcohol content, lower than most kombucha.

Hope you did not throw away anything. We’ll make vinegar and a beer from the dregs! Register for the January 27th event for more details and recipes.


Malted Grains, Koji and Rhizopus. Amazing tasty foods and brews. #Zymes2020:

Monday, Jan 27, 2020, 7:00 PM

Fifth Hammer Brewing Company
10-28 46th Ave Queens, NY

13 Members Went

Yeast starters and starter cultures that contain yeast – like the original koji for which the Chinese Kanji (麹) was created – sometimes also contain lactic acid or other types of bacteria, fungus and even other yeasts. Take, for example, sourdough starter. It’s easy to turn that into vinegar because there are already some bacteria and yeasts in the…

Check out this Meetup →