Blanch the tofu in boiling water and cut it into bite-sized pieces.
Drain the oil from the tuna using a sieve.
In a bowl, mix the tuna, chopped onion, minced garlic, chopped green onion, gochujang, doenjang, red pepper powder, sugar, sesame oil, and sesame seeds to make ssamjang.
Put the ssamjang on top of the tofu and enjoy.