1. Prepare old tofu and old shutters
2. Cut the old tofu into slices, change the old louver into a diamond shape, and blanch the tofu and louver with boiling water to remove the smell of tofu, squeeze it out and set aside
3. Pour rapeseed oil into the pot, heat up, add green onions and small river prawns and stir fragrant
4. Add tofu and veggies and continue to stir fry
5. Add cold water, if the tofu hasn't been used, bring to a boil
6. Add dark soy sauce, light soy sauce, white sugar, oyster sauce, black fungus, continue to boil, turn to low heat and simmer
7. Pour into the casserole and continue to simmer slowly, add the sliced carrots, slowly collect the juice, turn off the heat, and sprinkle with coriander leaves
