All you need to do is marinate the tuna with the combined sauce of oyster sauce, sesame oil and doubajiang spicy bean paste. The key for the flavor is to add a lot of onions.
This is a standby recipe in our house.
Use lean tuna.Whether you use frozen tuna or tuna offcuts, this will still be good.Not only the tuna but the onion will also taste so good.
Enjoy Japanese food around the world.