01 -
In a large bowl, gently combine the ground beef with salt and freshly ground black pepper. Divide into four equal portions and shape into patties, creating a slight indentation in the center of each to encourage even cooking.
02 -
Melt unsalted butter in a sauté pan over medium heat (180°C). Add the thinly sliced onions and cook, stirring frequently, until golden brown and richly aromatic, about 15 minutes. Set aside.
03 -
Grill or pan-fry the patties over medium-high heat for approximately 4-5 minutes per side, until the desired doneness is achieved. During the final minute, top each patty with a slice of Emmental or Swiss cheese to allow gentle melting.
04 -
Lay the toasted pretzel bun bases on plates. Top each with fresh arugula, a cheese-topped beef patty, a slice of Black Forest ham, a spoonful of caramelized onions, and a drizzle of cherry compote. Cap with the top bun and serve immediately.