- 2 pounds Laura's 92% Lean Ground Beef
- 1/4 teaspoon salt
- 1/2 teaspoon freshly ground pepper
- 3 tablespoons Creole mustard
- 1 large onion, thinly sliced
- 1 teaspoon sugar
- 1/2 teaspoon olive oil
- 4 slices Swiss cheese
- Vegetable cooking spray
- 8 whole grain buns, split and toasted
- 8 green or red lettuce leaf pieces
- 8 tomato slices
- 1 tablespoon ketchup (optional)
- 1 tablespoon light mayonnaise (optional)
- Combine lean ground beef and next 3 ingredients; (shape into 12 equal-size patties for 6 servings or 16 patties for 8 servings); cover and chill.
- Cook onions and sugar in hot oil over medium-low heat 30 minutes, or until caramel-colored, stirring occasionally. Cool 10 minutes.
- Spoon onions evenly over half of the patties. Top evenly with cheese slices, tearing cheese slices as needed to fit patties. Cover with remaining patties, pressing edges to seal.
- Coat grill rack with cooking spray. Grill, covered with grill lid, over medium-high heat (350 degrees to 400 degrees ) 5 to 7 minutes on each side or to desired degree of doneness.
- Arrange stuffed patties over bun bottoms, top with lettuce, tomato, and if desired, ketchup and mayonnaise.