In a large bowl, combine the ground beef with salt, black pepper, and Worcestershire sauce.
Divide the meat into eight equal portions, then shape them into patties.
Heat a skillet or grill to medium-high heat, then grease it with a little olive oil.
Cook the patties for about 3-4 minutes per side, until nicely browned.
In the last minute of cooking, place a slice of cheddar and provolone cheese on each patty and let it melt.
In another skillet, cook the bacon until crispy, then set aside.
In another skillet, melt the butter, then sauté the chopped red onion over medium heat until golden brown and caramelized.
Cut the hamburger buns in half, then toast the inside on a dry skillet or grill.
Spread the bottom half of the bun with mayonnaise, BBQ sauce, and Dijon mustard, then place the lettuce leaf on top.
Place the first cheesy patty on top, then sprinkle with the caramelized onions.
Add the second patty, then sprinkle with grated mozzarella cheese.
Top with tomato slices, pickle slices, and crispy bacon.
Place the top bun on top and serve immediately with french fries or a fresh salad.
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