For the beef:
1 teaspoon soy sauce
1 teaspoon Chinese rice cooking wine or dry sherry
1/2 teaspoon cornstarch
1/8 teaspoon freshly ground black pepper
3/4 pound flank or sirloin, sliced thinly across the grain

For the sauce:
2 tablespoons oyster sauce
1 teaspoon Chinese rice cooking wine or dry sherry
1 tablespoon soy sauce
1/4 cup chicken broth

For the stir fry:
3/4 pound broccoli florets
2 tablespoons high-heat cooking oil
2 cloves garlic, very finely minced or pressed through a garlic press
1 teaspoon cornstarch, dissolved in 1 tablespoon water