These leftover prime rib beef dip sandwiches are a quick and tasty dinner and a great way to use leftovers. These French dip sandwiches take just 15 minutes to prepare, perfect for busy weeknights.
Preheat the oven to broil while you prepare the remaining ingredients.
Slice the hoagie rolls in half, spread with butter, and place face-up on a baking sheet. Set aside.
Pour the gravy into a medium-sized pot and heat it over medium heat. While the gravy is heating, heat a large skillet over medium heat and add the leftover roast.
Let the beef heat for a few minutes, then add about 1/4 cup of gravy. Place a lid on the skillet and continue heating.
Place the rolls in the oven to melt the butter and toast the buns. Watch closely, as they won't take more than a few minutes. You are looking for golden brown.
Remove the rolls from the oven, top with beef, pour the gravy into small bowls, and serve.