8sliceSwiss cheeseor cheddar; 2 slices per sandwich
8slicerye breador sourdough
2tbspbuttersoftened for spreading
1tbspWorcestershire sauce
0.25cupmayonnaisefor secret sauce
0.25cupketchupfor secret sauce
1tbspyellow mustardfor secret sauce
0.25cupdill picklesfinely chopped, for secret sauce
Instructions
Preparation Steps
Make the secret sauce: in a small bowl combine mayonnaise, ketchup, mustard and chopped dill pickles; mix until smooth and refrigerate until assembly.
Prepare the onions: heat 1 tablespoon of butter in a skillet over medium heat; add the thinly sliced onion and cook, stirring occasionally, until deeply softened and caramelized, about 8–10 minutes. Remove and set aside.
Form four thin patties from the ground beef, season both sides with salt and pepper and brush each with Worcestershire sauce.
Cook the patties in the same skillet over medium-high heat for about 3 minutes per side, or until cooked through; remove and keep warm.
Assemble the sandwiches: spread softened butter on one side of each bread slice. On the unbuttered side, spread a tablespoon of secret sauce, add a slice of cheese, a cooked patty, a spoonful of caramelized onions and another slice of cheese; top with the second bread slice, buttered side out.
Heat a clean skillet or griddle over medium heat. Grill each sandwich 2–3 minutes per side until the bread is golden brown and the cheese is melted, pressing gently with a spatula.
Slice sandwiches in half and serve hot with extra secret sauce on the side if desired.
Notes
For best results use day-old bread and an 80/20 beef blend. Leftover patties can be refrigerated for 2 days.