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 brush with a little olive oil.
Cook the patties for about 3-4 minutes per side, until nicely browned.
During the last minute of cooking, place a slice of cheddar cheese on top of each patty and let it melt.
In another skillet, melt the butter, then add the finely chopped red onion and brown sugar.
Sauté the onions over medium heat for 5-7 minutes, until golden brown and caramelized.
Halve the hamburger buns, then lightly toast them in a dry skillet or on the grill.
Spread mayonnaise on the bottom half of the bun, then place a lettuce leaf on top.
Place the cheesy patty on top, then spoon a portion of the caramelized onions over it.
Add the tomato slices and pickled cucumber slices, then drizzle with a little mustard and ketchup.
Place the top of the bun on top, then serve immediately with French fries or a fresh salad.
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