• 1 pound beef sirloin, sliced thin and cut into strips
• 1 egg white
• 1 tablespoon cornstarch
• 1 tablespoon Chinese cooking wine
• 1/2 teaspoon salt
• oil
• 2 heads broccoli, cut into florets
• water
• 1 onion, peeled and sliced thinly
• 3 cloves garlic, peeled and minced
• 1 thumb-sized ginger, peeled and grated or finely minced

For the Stir-fry Sauce

• 1/2 cup poaching liquid, reserved from parboiling broccoli
• 1/3 cup oyster sauce
• 1/4 tablespoons Chinese cooking wine
• 2 tablespoons rice vinegar
• 2 tablespoons soy sauce
• 1 tablespoon brown sugar
• 2 teaspoons sesame oil
• 1 tablespoon cornstarch