The tua nao makers I know all let their cooked beans ferment in a rice sack, woven bamboo, or straw basket, so I use a basket. I assume it helps with fermentation. I have also left them in a little of their cooking water in a pot, and they fermented just fine.
Place the beans in a large pot, add water to cover by about
When you smell an agreeable, slightly sweet fermented odor, you’ll know you’re there. (If it smells bad or you see mold, discard the beans. I haven’t had this experience, but Mother Nature is sometimes fickle!)
You will have about
Stir in the salt, allowing about
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