Beef with oyster sauce

Method

1. 1 Soak the shiitake mushrooms for 30 minutes, then reserve the soaking water to use as a sauce.
2. 2 Slice the beef thinly across the grain, then marinate it with cornstarch, oyster sauce, and water for 30 minutes.
3. 3 Sauté the beef in a very hot pan over the highest heat for 90 seconds, then remove it from the pan.
4. 4 Sauté the ginger and shiitake mushrooms for 3 minutes, then pour in the mushroom soaking water and oyster sauce.
5. 5 Using the mushroom soaking water instead of plain water is a way to make the oyster sauce richer and more flavorful.
6. 6 Mix cornstarch with water to thicken the sauce, then add the beef and stir-fry for 30 seconds. Sprinkle with chopped scallions and sesame oil.