Beef Burger with Bacon and Cheese

For the spicy mayonnaise, combine all ingredients (mayonnaise, ketchup, red wine vinegar, grated onion, parsley, tarragon, Worcestershire sauce, salt, and pepper) in a bowl and let it sit in the refrigerator for 10 minutes.

Slice the tomatoes. Peel the red onion and cut it into fine rings. Fry the bacon on the grill or in a pan until golden brown and crispy on both sides, then set aside.

Form 4 equally sized patties from the ground beef (slightly larger than the buns). Season the patties with salt and pepper on both sides and brush with melted butter. Grill on a hot grill for approx. 3 minutes, flip, brush again with butter, and grill for another 2 minutes. Then place a slice of cheddar on each patty and let it melt for 1 minute. Let the cooked meat rest briefly.