In a large bowl, combine the ground beef with salt and freshly ground black pepper. Mix thoroughly, then divide into four equal portions and form into patties about ¾ inch (2 cm) thick.
Heat a skillet or grill pan over medium-high heat. Lightly brush the patties with olive oil and cook for about 3-4 minutes per side, until nicely browned.
During the last minute of cooking, place a slice of aged cheddar on each patty, then cover the pan to allow the cheese to melt.
In a separate skillet over medium heat, melt the butter. Sear the foie gras for 1-2 minutes per side, until golden brown. Be careful not to overcook, as it can dry out.
Meanwhile, halve the brioche burger buns and toast them in a dry skillet or brushed with a little butter until golden brown on the cut sides.
Prepare the vegetables: slice the tomato into thin rounds.
Spread truffle mayonnaise on the cut sides of the toasted buns to add a distinctive flavor to the burger.
Assemble the burger: place a lettuce leaf on the bottom bun, followed by the cheeseburger patty, seared foie gras, red wine caramelized onions, and finally the tomato slices. Top with the other half of the bun.
Serve immediately, preferably with hand-cut fries and a glass of red wine. Tip: For an even more luxurious flavor, grate a little truffle on top of the burger before serving.
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