Cut beef into bite-sized pieces and marinate with 1 tbsp cooking wine, 1/2 tbsp minced garlic, a pinch of pepper, and two pinches of salt.

Prepare the vegetables: slice king oyster mushroom, carrot, onion, green onion, and green chilies into bite-sized pieces.

Heat a suitable amount of cooking oil in a pan and sauté 1/2 tbsp minced garlic with chopped onion until fragrant.

Add marinated beef to the pan and stir-fry until 80% cooked.

Add the remaining vegetables except for green chilies and stir-fry until softened.

Add 1 tbsp tonkatsu sauce, 3 tbsp ketchup, and 100ml water to the pan. Simmer until the sauce thickens.

Add 1 tbsp butter and green chilies to the pan. Season with sugar or honey and salt to taste.