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The BEST Prime Rib Sandwich with Garlic Bread!!

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Tender slices of leftover prime rib is piled on garlic bread, topped with caramelized onions, melted cheese, horseradish sauce, and au jus, for the ultimate prime rib sandwich.

Prime Rib Sandwich

Turn your leftover prime rib into an incredible prime rib sandwich, complete with our flavorful prime rib recipes and rich au jus.

Houston’s Famous Prime Rib Dip Au Jus has nothing on this bad boy as it’s an amped up version of the classic french dip sandwich!  

Hand dipping a sandwich in au jus.
Ingredients to make a roast beef burger.

Ingredients And Substitutions

Here are the main ingredients needed to make this prime rib sandwich recipe. The full list can be found in the recipe card. 

  • Leftover Prime Rib: I created and tested this recipe using one 1/4″-1/2″ slice of beef, cut against the grain, from a leftover prime rib roast. Use a sharp knife or meat slicer to create shaved prime rib if you prefer that texture. Just start with cold meat as it’s easier to cut thin slices.
  • Bread: any hearty roll will work, such as French roll, ciabatta bread, hoagie roll, or baguette. You can also buy garlic bread, which will save you the time of making the garlic butter spread
  • Cheese: add slices of provolone cheese, Swiss, or cheddar to add creaminess to the sandwich.
  • Onions: sweet onions work best, but yellow onions and red onions will work as well. To cut down on time, use sautéed onion instead. 
  • Au Jus: If you have leftover prime rib au jus this is a great way to use it up. If not, whip up a batch using homemade au jus mix or a store bought packet.
  • Creamy Horseradish Sauce: leave off this element if you’re not a fan of horseradish. The garlic bread and au jus provides ample flavor so a classic “prime rib sandwich sauce” isn’t needed.
Slice of rare prime rib on a wood cutting board.

How To Re-heat Prime Rib For Sandwiches

That’s the genius of this recipe…the leftover prime rib slices are placed in the broiler, along with the rest of the sandwich, so they won’t overcook. Plus the au jus is served hot which will further “warm” the meat. No dry meat in this recipe! Your “pink center” will stay pink! 

If you need tips to reheat large slices or a prime rib roast, reference this How To Reheat Prime Rib guide.