Juicy beef patty, caramelized onions, melted cheese, and buttery bread come together in this classic American sandwich.
# Ingredient List:
→ Beef
01 - 1.1 lbs ground beef (80/20 blend)
02 - 1/2 tsp salt
03 - 1/2 tsp black pepper
→ Onions
04 - 2 large yellow onions, thinly sliced
05 - 2 tbsp unsalted butter
06 - 1 tsp sugar
→ Sandwich Assembly
07 - 8 slices rye bread or sourdough
08 - 8 slices Swiss cheese or American cheese
09 - 4 tbsp unsalted butter, softened
→ Optional
10 - 1 tbsp Dijon mustard
11 - 1 tbsp mayonnaise
# How to Make:
01 - Melt 2 tbsp butter in a large skillet over medium-low heat. Add sliced onions and sugar; cook, stirring frequently, until deeply golden and caramelized, about 20 to 25 minutes. Transfer to a bowl and set aside.
02 - Season ground beef with salt and pepper. Divide and shape into 4 thin oval patties matching the size of the bread slices.
03 - Heat a separate skillet or grill pan over medium-high heat. Cook patties 2 to 3 minutes per side until browned and just cooked through. Remove from heat.
04 - Arrange 8 bread slices. Spread a thin layer of softened butter on one side of each slice. Optionally, spread Dijon mustard or mayonnaise on the unbuttered side.
05 - On 4 slices with unbuttered sides facing up, layer one slice of cheese, a beef patty, a generous spoonful of caramelized onions, and another slice of cheese. Top each with remaining bread slices, buttered side out.
06 - Heat a clean skillet or griddle over medium heat. Cook sandwiches 2 to 3 minutes per side, pressing gently, until bread is golden and cheese melts.
07 - Remove sandwiches from skillet. Let rest 1 to 2 minutes before slicing in half and serving hot.