1. In a skillet, heat 2 tbsp vegetable oil and fry garlic and ginger until fragrant. Add ground pork and mushroom, continue stir frying until the meat is no longer pink. Add all the ingredient A to season. Stir and mix well.
2. Add leeks and fry until wilted.
3. Add dissolved katakuriko/potato starch in the mixture to thicken the sauce.