Thaw the frozen tofu, remove excess moisture, and cut it into bite-sized pieces.
Drain the oil from the canned tuna using a sieve.
Julienne the onion and green onion; mince the garlic.
Heat cooking oil in a pan and sauté the garlic and green onion to bring out the aroma.
Add the onion, stir-fry, then add the frozen tofu and cook until golden brown.
Add tuna and season with soy sauce, chili powder, and black pepper.
Once everything is well stir-fried, finish with sesame oil and sprinkling roasted sesame seeds.