Instructions:
- Caramelize the Onions:
- In a large skillet over medium to medium-low heat, melt 1 tablespoon of butter.
- Add the thinly sliced onions and cook, stirring occasionally, for about 25 minutes until they turn a deep brown color. Adjust heat as needed to prevent burning.
- During the last 5 minutes of cooking, stir in the apple cider vinegar. Once done, remove the caramelized onions from the skillet.
- Prepare the Patties:
- Divide the ground beef into two equal portions and shape them into thin 4-ounce patties, roughly matching the size of your bread slices.
- Season each patty with salt and pepper.
- Increase the skillet heat to medium-high and cook the patties for about 3 minutes on each side, ensuring they’re cooked through. Remove them from the skillet once done.
- Butter the Bread:
- Wipe the skillet clean and melt the remaining tablespoon of butter.
- Place all four bread slices in the skillet, ensuring one side of each slice is coated with butter. Remove two slices and set them aside.
- Assemble the Sandwiches:
- On the two bread slices still in the skillet, layer each with a slice of Swiss cheese, a cooked patty, half of the caramelized onions, and another slice of Swiss cheese.
- Place the reserved buttered bread slices on top of each sandwich, buttered side up.
- Cook the Sandwiches:
- Over medium-low heat, cook the assembled sandwiches for 3 to 4 minutes on each side until the bread turns golden brown and the cheese melts to oozy perfection.
- Serve:
- Slice the patty melts in half and serve immediately while warm. Optionally, serve with mustard on the side for dipping or spreading. Enjoy your delicious homemade patty melts!
