Marinate the sirloin at room temperature in a mixture of sherry, soy sauce, 1 teaspoon of the cornstarch, the sugar, 1/2 teaspoon of the oil, the pepper, and garlic for an hour. Heat 1 Tablespoon of the remaining oil in a wok over high heat. Stir-fry beef quickly, until the meat is brown outside and pink inside. Remove. Mix the remaining 2 teaspoons cornstarch with the oyster sauce. Reheat the wok with the remaining tablespoon oil. Add the broccoli and carrots; stir-fry for 30 seconds. Add the broth, cover the wok, and steam for approximately 1 minute or until the vegetables are tender but retain their crunch. Add the corn, snow peas, scallion, beef, and oyster sauce-cornstarch mixture. Heat quickly, until the sauce is clear and thickened. Serve immediately over rice or chinese noodles. Makes 4 servings. From the novel The Cereal Murders by Diane Mott Davidson. Formatted for MM by Pegg Seevers 7/11/94