Mongolian Beef Lettuce Wraps are a fun and healthy way to enjoy this dish. Instead of serving it over rice or noodles, the tender beef is wrapped in crisp lettuce leaves. This adds a refreshing crunch and reduces the carb content of the meal. The beef is stir-fried with the sauce and green onions before being spooned into the lettuce leaves. Serve it with a side of steamed vegetables for a light and flavorful meal.