Chop the green onion into small pieces.

Chop the onion into small pieces.

Prepare 600g minced pork, 1 tbsp minced garlic, and 1/2 tbsp minced ginger.

Add 1 tsp salt and 1/2 tsp black pepper.

Mix the chopped green onion and onion into the pork mixture.

Add 2 tbsp starch to the mixture.

Shape the pork mixture into round meatballs.

Heat a generous amount of vegetable oil in a pan over medium-low heat and cook the meatballs evenly on all sides.

Mix 10 tbsp tomato sauce, 3 tbsp ketchup, 1 tbsp soy sauce, 2 tbsp tonkatsu sauce, 1 tbsp sugar, and 5 tbsp water in a bowl.

Pour the sauce over the cooked meatballs and simmer gently. Cover the pan to ensure the meatballs are fully cooked.