Dice the tofu and blanch in boiling water for 2 minutes.
Drain the oil from the canned tuna using a strainer.
In a bowl, combine gochujang, doenjang, minced garlic, sesame oil, sesame seeds, and chopped green onions to make ssamjang.
Arrange the blanched tofu on a plate, then top with the tuna and ssamjang.