1: Prepare the ingredients by slicing the winter melon, pork, shiitake mushrooms, and tofu puffs.
2: In a pot, add water, oyster sauce, white pepper, salt, and ginger slices.
3: Bring the mixture to a boil, then add the roasted pork, shiitake mushrooms, tofu puffs, and winter melon.
4: Cover the pot and simmer for about 30 minutes until the winter melon is tender.
5: Mix in the cornstarch slurry to thicken the sauce.
6: Stir in the minced garlic and scallions just before serving.
