Cut beef steak into 1/8-inch thick strips. Combine sherry, soy sauce and cornstarch; pour over strips, stirring to coat.
Heat 2 tablespoons oil in large nonstick skillet over medium high heat.
Add mushrooms and pea pods; reserve.
Drain marinade from beef and reserve. Add remaining oil to skillet.
Stir-fry beef strips (1/2 at a time), 1 to 2 minutes. Return vegetables, beef and marinade to skillet; cook and stir until sauce thickens.
Serve beef mixture over lettuce. Garnish if desired.
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