1. Add a small amount of white vinegar to the rice and mix well.
2. Chop the tuna meat, cut the seaweed into fine pieces, and cut the dried radish into small pieces.
3. Pour the minced tuna and seaweed into the rice and mix well.
4. Spread out a tablespoon of the well-mixed rice in your hands, and pack a small amount of dried radish diced.
5. Group into a ball.
6. Mix a spoonful of steamed fish soy sauce, half a spoonful of sesame oil, a small amount of rice vinegar, and an appropriate amount of mustard to make a sauce.
7. Decorate a small amount of dried radish on the rice ball, and the delicious tuna rice ball is complete!
