In a large bowl, combine the ground beef with salt, black pepper, and Worcestershire sauce.
Divide the meat into four equal portions, then shape them into patties.
Heat a skillet or grill over medium-high heat and lightly brush with 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 provolone cheese on top of each patty and let it melt.
In another skillet, melt the butter over medium heat, then sauté the finely chopped onions until golden brown and caramelized.
Halve the hamburger buns and lightly toast them in a dry skillet or on a grill.
Spread mayonnaise on the bottom half of each bun, then top with a lettuce leaf.
Place the cheesy beef patty on top, then sprinkle with caramelized onions.
Add the tomato slices and pickled cucumber slices.
Top with the other half of the bun and serve immediately with french fries or a fresh salad.
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