Step 1Wash and soak the beans overnight in water to cover generously. Drain, reserving 4 cups of the soaking liquid. Place the beans in a Dutch oven or very large saucepan. Add the reserved liquid, the sugar, baking soda, salt and soy sauce. Bring to a boil. Remove the scum from the top and add 2 tablespoons of cold water. Cover and simmer over very low heat until the beans are tender, about 8 hours. Do not remove the lid during this process. Remove the pot from the heat and let the beans cool.