How to Make Soy Sauce

Soy sauce is one of the most popular condiments in the world, and it’s been used to flavor food for over 2000 years.^[1] Making your own soy sauce is a long (and smelly) process, but the final result is a delicious, complex flavor you’ll be proud to serve to your family and friends!

[Edit]Ingredients

To make soy sauce

• soybeans
• wheat flour
• Koji starter
• water
• salt

[Edit]Steps

[Edit]Making the Soy Sauce Base

1. Wash and sort of soybeans. You can get soybeans (or edamame) from some grocery stores, although you may need to visit a store specializing in Asian produce.^[2]
   
   • Make sure you remove the soybeans from their pods before you soak them.
   • If your market makes a distinction between soybeans (mature beans) and edamame (young, softer beans), use the soybeans.
   • To wash the soybeans, place them in a colander and rinse them under cold water. Pick out any beans which seem shriveled or discolored.
2. Soak the soybeans overnight. Place the soybeans in a large pot, then fill the pot with water until the soybeans are completely covered. This should take about of water. Drain the soybeans and add fresh water to the pot.
   
3. Boil the soybeans on medium-high heat for 4-5 hours. When they're finished cooking, you should be able to mash the soybeans easily with your fingers.
   
   • You can also use a pressure cooker to cook the soybeans more quickly if you like. Place the beans in the pressure cooker, add about of water and close the lid. Place the pressure cooker over high heat, then reduce the heat when the pressure cooker begins to whistle. Cook the soybeans for about 20 minutes.
4. Mash the soybeans into a paste. Use a food processor, the back of a spoon, or a potato masher to mash the soybeans until they are a smooth consistency.^[3]
   
5. Mix of wheat flour with the soybean paste. This should create a dough-like substance. Knead the mixture together until it’s thoroughly blended.^[4]
   
6. Add koji starter to your soybean mixture and mix well. Soy sauce gets its flavor from the microbes Aspergillus oryzae and A. flavus. Traditionally, the fermenting mold was developed by allowing the soybean mixture to sit for a week. However, you can purchase the mold spores, known as koji starter, online or from some specialty health food stores.^[5]
   
   • Read the packaging to determine the amount of koji starter you should add, as it may vary by brand.
   • If your soybeans were still warm when you mixed them with the flour, cool the mixture to about body temperature before you add the starter.
7. Transfer the koji mixture to a tray that's about deep. You will leave the koji in the tray while it ferments. Spread the mixture out so it's no more than deep.
   
8. Use your fingers to make furrows in the mixture to increase the surface area. Press down to make long rows through the koji mixture. The furrows should be about deep and apart. They should resemble furrows for planting seeds in a garden.^[6]
   
9. Allow the koji mixture to rest for 2 days in a warm, humid place. This will allow the cultures to develop. You should see the Aspergillus bacteria growing on the soybean and flour mixture. It should appear light to dark green.^[7]
   
   • After the 2 days have passed, move on to fermenting in a brine mixture.
   • Choose a spot where the koji won't be disturbed as it ferments. The kitchen is ideal if you can handle the smell — try placing the tray in a kitchen cabinet or on top of the refrigerator.

[Edit]Fermenting and Pasteurizing the Sauce

1. Dissolve of salt in of water. Pour the salt into the water and stir until it's completely mixed together. This salt water brine will help keep unwanted bacteria from growing as you ferment your koji.^[8]
   
2. Mix the koji into the brine to create moromi. Place the koji into a large jar with a tight lid. The jar should hold about of liquid so you'll have room to stir your mixture. Pour your brine over the top of the koji and stir it with a long-handled spoon. The thick koji paste will not dissolve into the brine, but the soy and Aspergillus will begin to seep into the water.^[9]
   
3. Cover the moromi and stir it once a day for the first week. Keep the moromi in a place with a warm, stable temperature and stir it daily with your long-handled spoon.
   
   • As the koji ferments, it will probably produce a strong odor, so keep it covered tightly when you’re not stirring it.
4. Stir the moromi once a week for the next 6-12 months. The fermenting process is what really allows the flavors to develop. You’ll need to give your soy sauce at least 6 months to ferment, although for a deeper flavor, you might want to wait up to a year.^[10]
   
5. Strain the mixture once it's finished fermenting. Once you feel your flavors have developed enough, you should strain your moromi mixture. Place the solids in a press or a piece of cheesecloth to ensure you get all of the liquid out.
   
   • Discard the solids from this process.
6. Pasteurize the soy sauce by heating it to . Heat your soy sauce over medium-high heat, then use a thermometer to ensure the mixture stays at this temperature for 20 minutes. Once you have finished pressing the mixture, transfer the liquid to a heat-safe pot and use a candy thermometer to monitor the temperature. Proper pasteurization will ensure there is no harmful bacteria in your soy sauce.^[11]
   
7. Bottle and serve your soy sauce. Pour your pasteurized soy sauce into a container with a tightly-closed lid and refrigerate it. You may prefer to pour some of your soy sauce into a smaller container to make it easier to serve.
   
   • The finished soy sauce should last for up to 3 years if it's sealed and 1-2 years in an opened container.^[12]

[Edit]Video

[Edit]Things You’ll Need

• Colander
• Bowl for soaking soybeans
• Long-handled spoon for stirring
• Large pot
• Press or cheesecloth
• deep tray
• jar with tight-fitting lid
• Candy thermometer
• Bottle

[Edit]Related wikiHows

• Make Soy Yogurt
• Make Soy Milk Chocolate Sauce
• Make Soy Patties
• Make Buttery Soy Noodles

[Edit]References

[Edit]Quick Summary

1. ↑ http://www.foodrepublic.com/2017/03/28/make-soy-sauce-asias-seasoning/
2. ↑ https://tastessence.com/how-to-make-soy-sauce
3. ↑ https://tastessence.com/how-to-make-soy-sauce
4. ↑ https://tastessence.com/how-to-make-soy-sauce
5. ↑ https://www.researchgate.net/publication/249967710_Study_on_the_Production_of_Fermented_Soybean_Sauce_by_Using_Aspergillus_oryzae_and_Aspergillus_flavus
6. ↑ http://permacultureproduce.com.au/home-made-soy-sauce/
7. ↑ https://tastessence.com/how-to-make-soy-sauce
8. ↑ https://www.researchgate.net/publication/249967710_Study_on_the_Production_of_Fermented_Soybean_Sauce_by_Using_Aspergillus_oryzae_and_Aspergillus_flavus
9. ↑ http://www.foodrepublic.com/2017/03/28/make-soy-sauce-asias-seasoning/
10. ↑ https://www.japancentre.com/en/pages/94-koji/print
11. ↑ http://www.bccdc.ca/resource-gallery/Documents/Educational%20Materials/EH/FPS/Food/pasteurizejuiceandcidersafely.pdf
12. ↑ https://www.thekitchn.com/how-long-can-you-keep-opened-condiments-tips-from-the-kitchn-45971

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