1. Peel and wash the onion and cut into small pieces.
2. Soak the chopped onion in cold water for 10 minutes to remove the spicy taste.
3. Chop the red and sweet peppers for use. Drain the tuna oil and put it into a container. Stir with chopsticks.
4. Put the chopped onion into the water and mix it with tuna.
5. Add the red pepper, white pepper and lemon juice.
6. add a little salt seasoning and mix all the ingredients well to eat.