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Ingredients

• 1-1/2 cups  sliced onions (about 3 medium)
• 8 oz.  button or cremini mushrooms, sliced (3 cups)
• 1 Tbsp.  olive oil
• 2 Tbsp.  snipped fresh parsley
• 2-1/2 lb.  85-percent lean ground beef
• 1/3 cup  Worcestershire sauce
• 4 cloves  garlic, minced
• 1-1/2 tsp.  salt
• 1 tsp.  ground black pepper
• 16 slices  applewood smoked bacon (about 1 lb.) (optional)
• 8 slices  Swiss, provolone, and/or Colby and Monterey Jack cheese (optional)
• 8   Kaiser rolls or hamburger buns, split and toasted*
•   Tomato slices (optional)

Description

Mushrooms And Caramelized Onions Are Tucked Into The Center Of Ground Beef Patties Before Grilling.

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