Made by boiling black soybeans and soybeans, blended to resemble yogurt.
Soak the beans in water.
Boil the soaked beans thoroughly.
After cooling the boiled beans, put them in a blender.
Add beans, water, lemon juice, salt, and sweetener, then blend until smooth.
Strain the mixture through a fine sieve.
Transfer to an airtight container and ferment in the refrigerator for 8~12 hours.
Serve the fermented soy yogurt in a bowl.