Mix soy sauce, oyster sauce, rice wine, sugar, and white pepper together in a small saucepan. Cook and stir over medium-low heat until heated through, about 5 minutes.
Mix water and cornstarch together in a small bowl. Pour into the saucepan; simmer until sauce thickens, about 5 minutes.
Substitute sherry for the rice wine if preferred.
If using in a stir-fry: Stir fry your choice of vegetable or meat. Add the mixture from step 1; toss to coat. Dissolve cornstarch in water; stir into the pan and cook until thickened, 3 to 5 minutes.
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