1: Boil choy sum and shiitake mushrooms in a pot with water and salt. Add 1 tablespoon of oil.
2: In another pot, braise the mushrooms with ginger, minced garlic, oyster sauce, wine, and water.
3: For the fish maw, rehydrate in water with scallions and ginger slices until softened.
4: Combine the braised mushrooms with fish maw and abalone in a serving dish.
5: Serve hot with your choice of rice or noodles.