1. Heat 1 tbsp vegetable oil in a wok over high heat. Add garlic, ginger and stir fry them until they are fragrant. Add minced pork and continue to stir-fry until no longer pink.
2. Add leek and cook a little more.
3. Add all seasoning ingredients and stir-fry at high heat, bring to a boil. Lastly slide the tofu gently into a wok.
4. Stir gently to blend the tofu without breaking it up. Reduce the heat to low and simmer for about 5 mins. Add chili here if you like it. Meanwhile in a small cup, mix katakuriko and water together. Pour the katakuriko mixture into the wok. Stir-fry it all for about 30 seconds.