1 and 1/2tbspsalt(only if using Vietnamese soy sauce, omit if using regular Japanese soy sauce)
2tbsprice flour
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Instructions
Drain the soybeans and transfer to a pressure cooker or Instant Pot. Cover with water (about 8 cups) and close with the lid. Pressure cook for about 50 minutes. The soybeans should be tender, if they are still chewy cook for another 10 minutes. If you don't have a pressure cooker, boil the soybeans for about 2 hours, checking from time to time until tender.
Reserve about 1/2 cup of the soybeans cooking water and drain the soybeans.
Pour the reserved soybean cooking water, soy sauce, and sugar into a large saucepan or deep skillet. Bring to a simmer and cook for about 5 minutes, or until the sugar has fully dissolved.
Add the soybeans and let it simmer for another 10 minutes uncovered. In the meantime, prepare 2 clean jars.
Dissolve the 2 tbsp of rice flour in 2 tbsp of water and add to the skillet. Cook for another 2-3 minutes, stirring regularly until the sauce has slightly thickened. Remove from heat and let cool about 30 minutes before transferring to the jars.
Close the jars with the lid and let them sit for at least 7 days, or up to 14 days at room temperature. This will allow the flavors to merge and the soybeans to soak up the flavors of the sauce.
Keep in the refrigerator for up to 6 weeks. Use in stir-fries, stews, and dipping sauce!