
Here’s another leftover prime rib idea. Happy Friday! Prime Rib Sliders Slices of leftover prime rib1 package King’s Hawaiian Rolls12 slices Swiss cheeseOnion powderGarlic powderMelted butter, for topping rolls Caramelized Onions:4 large sweet onions halved and cut thinly1/4 cup butterKosher salt and fresh-ground pepper, to taste4 tbsp balsamic vinegar4 tbsp brown sugar6 fresh rosemary stems2 bay leaves Horseradish Cream Sauce:2 tbsp prepared horseradish1/4 cup sour cream2 tsp Worcestershire sauce2 tsp Sriracha Caramelized Onions:Cut the onions in half, then slice them thinly.Melt the butter in a large skillet, then add the onions.Cook over low-medium heat until the onions are softened. About 20 minutes.Then add the rosemary stems and bay leaves. Mix. Cook for about 20 more minutes, until the rosemary has wilted.Once the rosemary has wilted, remove it and the bay leaves. You will likely have to remove stray rosemary leaves.Stir in the balsamic vinegar, sugar, salt and pepper.Continue cooking until the liquid is all gone, and the onions are caramel colored and soft. Be very careful not to burn the mixture, so stir often. Horseradish Cream Sauce:Combine the horseradish, sour cream, Worcestershire sauce and Sriracha. I like to use a hand blender to make the sauce nice and creamy. Putting it all together:Pre-heat your oven to 350Cut the entire pack of rolls in half horizontally, keeping each half intact and connected. Place the bottom half of the rolls on a foil lined baking sheet. Top with the roast beef (about 1 slice per roll). Dollop the beef with the horseradish cream sauce. Spread the onions in an even layer over the top, then top with the cheese. Place the top layer of rolls over the cheese. Brush the top of the rolls with the melted butter. Sprinkle with the garlic powder and onion powder.Cover the baking sheet with aluminum foil and bake for 15 minutes. Uncover and bake until the cheese is melted and the rolls are lightly browned, 5 to 7 minutes more. Let cool for 5 minutes before serving.