1. Soak the dried soybeans in cold water overnight.
2. Add water to a boiling pot, add star anise, pepper, and soybeans.
3. Put the dark soy sauce, salt, and sugar, bring to a boil on high heat, change to low heat.
4. Cook until the soup will be dry and the skin of the soybeans is wrinkled, then turn off the heat.
5. Soy soy sauce with salty and sweet flavor is ready.
Tips:Don't add too much salt, because soy sauce is also salty.
