Ingredients:1 1/2 pounds Certified Angus Beef ® ground chuck
2 portabella mushrooms
1/2 cup Lea & Perrins® Worcestershire sauce
1/2 cup mayonnaise
2 tablespoons Dijon mustard
2 tablespoons chopped parsley
4 slices cheddar cheese
8 slices bacon, cooked
1/2 red onion, sliced
4 hamburger buns
Salt and freshly ground black pepper to taste

Instructions:1. Marinate mushrooms for 30 minutes in Worcestershire sauce (reserving 1 tablespoon).
2. Combine mayonnaise, remaining Worcestershire, mustard, parsley, and 1/2 teaspoon pepper.
3. Remove mushrooms from marinade (discard unused marinade) and grill; slice mushrooms.
4. Form ground chuck into 4 patties. Season with salt and pepper and grill. Just before desired doneness is reached (recommended 160°F internal temperature), top burgers with cheese and grill until cheese melts.
5. Generously spread bun with flavored mayonnaise, top with burgers, red onion, mushrooms and bacon.

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