Ingredients
Method
- Melt 1 tablespoon butter in a skillet and cook sliced onions over medium-low heat until caramelized.
- Season ground beef with salt and pepper and shape into thin patties.
- Cook patties in a skillet for 3–4 minutes per side until browned.
- Mix mayonnaise, ketchup, and mustard to make the sauce.
- Butter the outside of bread slices and assemble sandwiches with cheese, beef patty, onions, and sauce.
- Grill sandwiches in a skillet until bread is golden brown and cheese melts.
- Serve hot.
Notes
- Cook onions slowly for the best flavor.
- Thin patties work best for sandwiches.
- Use medium heat to prevent burning the bread.
- Serve with fries or pickles for a classic diner meal.
