01 -
1 pound ground beef
02 -
1 medium onion, finely chopped
03 -
1 can (10.5 oz) French onion soup
04 -
1 tablespoon Worcestershire sauce
05 -
Salt and pepper, to taste
06 -
4 pieces burger buns, toasted
→ Optional toppings
07 -
Sliced provolone, gruyère, or Swiss cheese for topping