4.
Add rice cakes to wok. Add broth and cook uncovered 1 to 2 minutes, stirring constantly. Add oyster sauce, pepper, and the rest of the oil as needed. Stir constantly to prevent rice cakes from sticking too much. Cook until rice cakes are soft but still chewy, about 1 minute. Add vegetables and pork back to wok and stir to mix evenly. Serve immediately, garnishing with green onions.