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Prime Rib Steak Sandwiches

An incredible use for leftover prime rib? Prime rib steak sandwiches layered with melted provolone cheese, slices of prime rib, caramelized onions, arugula, and horseradish cream sauce.
Course easy
Cuisine barbecue, bbq, lunch, prime rib roast, sandwich
Keyword leftover steak recipe, prime rib sandwich, steak sandwich recipes, steak sandwich sauce
Prep Time 45 minutes
Cook Time 40 minutes
Total Time 1 hour 25 minutes
Servings 4 sandwiches

Ingredients

  • 1-1 1/2 lbs leftover prime rib or other steak (about 4-6 oz per person)
  • 1 white onion sliced
  • 8 slices provolone cheese
  • 2 cups arugula or other crunchy green, lightly packed
  • 1 baguette
  • Horseradish Cream Sauce below

For the Horseradish Cream Sauce

  • 3/4 cup sour cream
  • 3 tablespoons horseradish
  • 1 tablespoon Dijon mustard
  • 2 tablespoons fresh squeezed lemon juice
  • 1 tablespoon white wine vinegar
  • 1/2 teaspoon salt
  • 2 tablespoon fresh chives finely chopped

Instructions

For the Prime Rib Sandwiches:

  • Preheat oven to 325 degrees.
  • To make the caramelized onions: heat up a large pan on the stovetop to medium heat then add 2 tablespoons olive oil and the sliced onions. Stir occasionally until the onions are soft, golden/starting to brown, and sweet to the taste (roughly 30-40 minutes). Remove from heat. *You may need to adjust the heat and turn it down if they are browning too fast.
  • In the meantime, place your leftover prime rib in a large cast iron (or oven proof) pan and place in the oven to heat up (approx 15 - 20 minutes). Remove from oven and slice into thin slices.
  • To build your sandwiches: cut the baguette into 4 equal size pieces and cut in half, lengthwise. Place on a baking sheet, open faced, and place two pieces of cheese on bottom half of each sandwich.
  • Place under the broiler for a couple minutes to melt the cheese (paying close attention to not burn the bread).
  • Once the cheese is melted, remove from the oven and build each sandwich: add 3-4 slices of the warm steak, a small handful of arugula, and a couple tablespoons of caramelized onions, then top with 1-2 tablespoons of creamy horseradish sauce. Serve immediately and enjoy the heck out of these epic sandwiches.

For the Horseradish Cream Sauce:

  • Place all ingredients in a bowl and mix together.

Notes

If your steak is already sliced up you can just warm it up on the stovetop on on a small skillet. Alternatively you can add the thin steak slices on top of the provolone just before placing into the oven to broil and melt the cheese.