In a bowl, combine the ground beef with salt and freshly ground black pepper. Mix well, then divide into four equal portions and shape into patties about 2 cm thick.
Heat a skillet or grill pan over medium-high heat. Brush the patties with a little olive oil, then cook on both sides for about 3-4 minutes, until nicely seared.
During the last minute of cooking, place a slice of aged cheddar cheese on each patty, then cover the pan to allow the cheese to melt.
In another skillet over medium heat, melt the butter and sear the foie gras for 1-2 minutes on each side, until golden brown. Important: Do not overcook, as it may dry out!
Cook the pancetta in a dry skillet until crispy, then set aside on a paper towel to drain excess fat.
Meanwhile, halve the burger buns and toast them in a dry skillet or brushed with a little butter until golden brown on the inside.
Prepare the vegetables: slice the tomato into thin rounds.
Spread truffle mayonnaise on the cut sides of the toasted buns for a distinctive flavor.
Assemble the burger: on the bottom bun, place a lettuce leaf, followed by the cheesy patty, the seared foie gras, the red wine caramelized onions, and the crispy pancetta. Top with the other half of the bun.
Serve immediately, preferably with hand-cut french fries and a glass of red wine. Tip: For an even more luxurious experience, grate a little truffle on top of the burger before serving.
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