Step 1: Marinate Beef
In a bowl, combine the sliced beef with 1 tablespoon soy sauce, cornstarch, and a pinch of sugar. Mix well and let it marinate for at least 10 minutes.
Step 2: Prepare Sauce
In a small bowl, mix the remaining soy sauce, oyster sauce, hoisin sauce, water, and sugar. Set aside.
Step 3: Sauté Onions
Heat 1 tablespoon of vegetable oil in a large pan or wok over medium-high heat. Add the sliced onions and stir-fry until they are softened and slightly caramelized, about 5 minutes. Remove from the pan and set aside.
Step 4: Cook Beef
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