1 crab (about 1 1/2 – 2 pounds)
2 inches ginger (peeled and sliced into 10-12 pieces)
3 stalks scallion (cut into 2-inch length)
3 tablespoons corn starch (for frying)
1 tablespoon cooking oil
Oil for deep frying

Sauce:

1 tablespoon oyster sauce
2 dashes white pepper powder
1/8 teaspoon sesame oil
1/2 teaspoon sugar
6 tablespoons water
3/4 teaspoon corn starch
1/8 teaspoon fish sauce