Olivia found a great recipe for patty melts on the Food Network's Pioneer Woman web site. The Pioneer Woman recipe is a classic patty melt but you can make it your own by substituting cheddar cheese, or provolone. You can also use various varieties of rye bread including pumpernickel if you like. If you have never had a patty melt, try one. The rich flavor of the onions and the creamy goodness of the cheese on the toasted bread make this one of the best sandwiches around. Give it a try!
In a medium skillet, melt 2 tablespoons of the butter over medium-low heat. Throw in the sliced onions and cook slowly until the onions are golden brown and soft, 20 to 25 minutes, stirring occasionally.
In a medium bowl, mix together the ground beef, Worcestershire and some salt and pepper. Form into 4 patties.
Melt 2 tablespoons of the butter in a separate skillet over medium heat. Cook the patties on both sides until totally done in the middle.
Assemble the patty melts this way: Slice of bread, slice of cheese, hamburger patty, a quarter of the cooked onions, another slice of cheese and another slice of bread.
On a clean griddle or in a large skillet over medium heat, melt 2 tablespoons of the butter and grill the sandwiches until golden brown. Remove the sandwiches and add the remaining 2 tablespoons butter to the skillet. Return the sandwiches to the skillet, flipping them to the other side. Cook until golden brown and crisp, and until the cheese is melted. Slice in half and serve immediately!