Chop 1/4 onion and 1 piece of green onion. Prepare 1 tsp minced garlic. Reserve some chopped onion for both the sauce and the mixture.

Crush the tofu with a knife, wrap it in a cloth, and squeeze out the water. Repeat 2-3 times, but avoid over-squeezing to prevent dryness.

Mix ketchup, Worcestershire sauce, oligosaccharide, and water to prepare the steak sauce.

Heat a pan with a small amount of cooking oil and butter. Add minced garlic and chopped onion, and sauté over low heat until fragrant. Add the prepared steak sauce and simmer briefly. Optionally, add a pinch of basil powder.

Drain the tuna can and mash the tuna. In a bowl, combine tofu, tuna, chopped green onion, chopped onion, egg white, salt, and black pepper. Knead the mixture thoroughly.

Shape the mixture into bite-sized pieces.

Heat a pan with a small amount of oil and pan-fry the tofu steaks until golden brown on both sides.

Remove excess oil from the cooked tofu steaks.