Leftover Prime Rib Patty Melt

Prime rib patty melt cut in half on parchment paper.

Leftover Prime Rib Patty Melt

Tender slices of leftover Prime Rib replace traditional burger patties for a twist on the classic patty melt. Each sandwich is layered with caramelized onions and melted Swiss cheese, then grilled on buttery rye bread until golden and crisp. It’s the ultimate leftover prime rib recipe. leftover Roast.

Course Dinner, Lunch

Cuisine American

Keyword Caramalized Onions, Leftover Prime Rib

Prep Time 15

Cook Time 45

Total Time 1

Servings sandwich

Calories 571kcal

Author Darcey Olson

Cost $4

Ingredients

CARAMELIZED ONIONS

2 tbsp unsalted butter
1 small onion, thinly sliced
1 tsp apple cider vinegar

PATTY MELT

¼ cup beef au jus, beef consommé, or beef broth *Note 1
1 slice leftover prime rib, ¼ inch - ½ inch thick *Note 2
1 tbsp unsalted butter
2 slices rye or marble bread
1-2 slices Swiss cheese
salt, to taste *Note 3

Instructions

CARAMELIZED ONIONS

Pre-heat a medium-size sauce pan over medium heat.
Add the butter. Once melted, add the onions and toss to combine. Cover and let the onions cook, uninterrupted, for 5-6 minutes. Remove the lid, and stir for 1 minute.
Turn the heat to low (towards the high-end of low) and stir every 6-7 minutes for 30-35 minutes, or until the onions are dark brown. Add the vinegar and use a wooden spoon to deglaze, making sure to scrap up the brown bits on the bottom of the pan. Cover and set aside.

RE-HEATING THE PRIME RIB

Add the beef broth to a large skillet and turn the heat to medium-high. Once simmering, turn the heat to medium. Add the slice of prime rib and let cook for 1 minute per side. Remove and place on a paper towel lined plate.

MAKE THE PATTY MELT

Use a paper towel to clean out the remaining beef broth and remnants in the skillet. Return to the heat.
Butter the outside of the bread slices. Place one slice of bread (butter side down) in the skillet. Immediately top with the cheese, the warmed prime rib steak, caramelized onions, and the top bread slice (butter side facing out).
Use a spatula to gently press down on the sandwich to compact all the ingredients. Cook for 2-3 minutes per side until the cheese is melted and the bread is toasted.
Remove and serve immediately for best texture.

Notes

Note 1 - If you don't have any of these on hand, you can use water.

Note 2 – Any leftover prime rib will work well. Keep in mind the prime rib rub utilized will influence the final flavor of the sandwich.

Note 3 - You may or may not need extra salt. It depends how salty the beef is that you're using. I recommend waiting until the entire sandwich is pulled together, taste, and salt as needed.

Nutritional information is estimated.

Nutrition