1. In a bowl, add all the ingredient A and knead until well combined and sticky. Set aside.
2. Gently pat the lotus root dry with a paper towel. On a slice of lotus root, place about 2 tbsp filling from #1 and spread. Cover with another slice of lotus root on top and press down to make a sandwich.
3. In a small cooking pot, add the sauce ingredient and bring it to boil. Simmer for a few minutes until the sauce is slightly thickened. Set aside.
4. Coat the lotus roots 'sandwich' with katakuriko thinly. When all are ready, add a generous amount of oil to a skillet on medium-low heat and place the sandwiches gently on it. Cook one side until browned and flip to the other side. Cover and simmer for about 5 mins or cook until meat is cooked through.
1. Wrap the tofu with kitchen paper towels and put it in the microwave for 1 to 2 minutes to drain the water. Let it cool to room temperature and mash it in a bowl. Set aside.
2. In a frying-pan, heat 1 tbsp oil and fry garlic and ginger until aromatic. Then add zha cai and stir-fry for a few more minutes. Add the ingredient A to season. Let it cool to room temperature.
3. In a bowl add ground beef, the drained tofu from #1, zha cai from #2 and the ingredient B. Mix until well combined and sticky.
4. Shape into patties. In a skillet, heat 1 or 2 tbsp vegetable oil over medium-high heat. Place the patties and reduce the heat to low. Fry them on both sides until nicely brown or until cooked through. Cover and cook for another 5 mins.