Cut mushrooms, tofu, and green onion into bite-sized pieces.
Pour water into a pot and bring it to a boil.
Once the water is boiling, dissolve the doenjang (soybean paste) in it.
Add mushrooms and tofu, then boil for about 5 minutes.
Add minced garlic and green onion, then simmer for a little longer.
Taste and adjust the seasoning with soup soy sauce or salt if needed.