Ingredients
Method
- In a small bowl, mix mayonnaise, ketchup, and relish to create the sauce. In a skillet, cook ground beef over medium-high heat until browned, drain excess fat. Add sliced onions to the same skillet, season with salt and pepper, and cook until caramelized (8–10 minutes). Combine cooked beef and onions in the skillet, then deglaze with 2 tablespoons water to remove excess fat. In the same skillet, grill rye bread slices with butter until toasted. Place cheese slices on warm bread, top with patty mixture, spread sauce on the second slice, and wrap to form a sandwich. Toast all sides until golden and cheese is melted.
Notes
Substitute rye bread with challah or sourdough if preferred. Use Gouda instead of Swiss cheese if desired. For a crisper finish, grill the bread until dark brown. Store leftovers wrapped in foil in the refrigerator for up to 3 days.