Thinly slice half a block of tofu and place it in a microwave-safe container.

In a separate bowl, combine gochujang, gochugaru, soy sauce, allulose, minced garlic, chopped scallions, and water to make the sauce.

Rinse the aged kimchi with water and chop it into small pieces.

Layer the chopped kimchi, canned tuna, and the prepared sauce over the sliced tofu.

Cover the container and cook in the microwave for 5 minutes.

After cooking, drizzle with sesame oil and sprinkle with sesame seeds before serving.