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    Home » Recipes » Beef Recipes

    Leftover Prime Rib Sandwich

    Published: Dec 26, 2022 by Chef Dennis Littley

    82 shares
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    • Yummly
    5 from 37 votes
    Jump to Recipe Print Recipe

    Sometimes I think I make a Prime Rib Roast, so I have leftovers to make the Best Prime Rib Sandwich. But don’t worry if you don’t have leftover prime rib; this also makes an incredibly delicious leftover Roast Beef Sandwich!

    prime rib sandwich on white plate

    If you have leftover prime rib roast, this is a delicious way to make use of the prime rib leftovers. My Prime Rib sandwich is loaded with slices of tender, juicy, medium-rare seasoned prime rib and topped with warm caramelized onions and mushrooms. Finished with a slathering of my creamy horseradish sauce.

    prime rib sandwich

    Add some arugula to the sandwich, so you can say you ate your vegetables. Seriously, it adds another level of flavor to this prime rib sandwich recipe!

    *Not a fan of mushrooms; you can leave them out. Of course, you’ll never know what you’re missing!

    Prime Rib Sandwich Ingredients

    ingredients to make sandwich

    Let’s start by gathering the ingredients we need to make Prime Rib Sandwich. In Chef Speak, this is called the “Mise en Place,” which translates to “Everything in its Place.”

    Not only does setting your ingredients up ahead of time speed up the cooking process, it also helps ensure you have everything you need to make the dish.

    • thin slices of leftover prime rib
    • sweet caramelized onions and mushrooms
    • loaf of french bread (or hoagie roll)
    • creamy horseradish sauce (or mayonnaise and prepared horseradish)
    • arugula
    • au jus

    If you’re not a fan of mayonnaise, dijon mustard would be a tasty substitute.

    How to make caramelized onions & mushrooms

    collage showing how to caramelize onions and mushrooms
    • Melt 2 tablespoons of butter in a large skillet. When the butter is melted, add the sliced onions and mushrooms to the pan.
    • Saute the onions and mushrooms over high heat until they begin to brown. Let them cook for 3-5 minutes without moving them around, so they have a chance to begin the caramelization process.
    • Turn the mushrooms and onions over and reduce to medium heat and let them continue to cook for another 5-7 minutes. Stir them around during this part of the process.

    *The sweet caramelized onions and mushrooms help make this the Best Prime Rib Sandwich. But if you’re not a fan of mushrooms? It’s okay to leave them out.

    trimmed piece of cooked beef

    While the mushrooms and onions are cooking, trim the leftover prime rib. Remove the bone and extra fat from the edges of the meat. Take out any fat deposits from the middle of the beef ( I took this picture before removing the piece of fat in the middle).

    Slice the prime rib into thin slices.

    How to make Leftover Prime Rib Sandwich

    collage showing how to make sandwich
    • Slather a good amount of creamy horseradish sauce on the french bread.
    • Add a good handful of arugula (the peppery flavor really of arugula improves the overall flavor of the sandwich).
    • Place thinly sliced prime rib on top of the arugula ( I like to fold the meat, setting it side by side so it’s not just lying on top of each other).
    • Add the caramelized onions and mushrooms to the sandwich.

    *Add a few slices of provolone cheese (or swiss cheese) to the sandwich for additional flavor. If you want melted cheese, add the slices before the warm mushrooms and onions, and the heat will help melt the cheese.

    prime rib sandwich on white plate

    Serve the sandwich with au jus and extra horseradish sauce.

    Make this sandwich with leftover roast beef and you’ve got yourself a variation on the classic French Dip sandwich.

    Recipe FAQ’s

    How do you reheat prime rib?

    Place the leftover prime rib roast in a baking dish with a ¼ cup of beef broth. Cover the dish with foil and place it in a preheated to 300°F oven. Reheat until an internal temperature of 165 degrees has been reached.

    What should I serve with a prime rib sandwich?

    Green Salad, pasta salad, and potato salad are all great choices. Mac and cheese and roasted potatoes are tasty hot choices.

    What kind of bread should I use for a prime rib sandwich?

    I like using a French baguette, but hoagie rolls or kaiser rolls are also good choices. Toasting the roll is also a nice touch.

    More Recipes You’ll Love!

    • Best Prime Rib Roast {Standing Rib Roast}
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    • Oven Roasted Leg of Lamb

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    prime rib sandwich on white plate
    Print Recipe Save Saved!
    5 from 37 votes

    Leftover Prime Rib Sandwich

    If you have leftover prime rib roast, this is a delicious way to make use of the prime rib leftovers. My Prime Rib sandwich is loaded with slices of tender, juicy, medium-rare seasoned prime rib and topped with warm caramelized onions and mushrooms. Finished with a slathering of horseradish sauce.
    Prep Time10 mins
    Cook Time10 mins
    Total Time20 mins
    Course: sandwich
    Cuisine: American
    Servings: 4
    Calories: 533kcal
    Author: Chef Dennis Littley

    Ingredients

    • 1 lb leftover prime rib thinnly sliced
    • 1 large sweet onion sliced
    • 8 oz mushrooms sliced
    • 1 cup arugula
    • 1 baguette or hoagie rolls
    • 1 cup au jus
    • ½ cup creamy horseradish sauce *see recipe
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    Instructions

    • Prepare your horseradish sauce by mixing the sauce ingredients together in a small bowl and refrigerate until needed.
    • Melt 2 tablespoons of butter in a large skillet.
    • When the butter is melted, add the sliced onions and mushrooms to the pan.
    • Saute the onions and mushrooms over high heat until they begin to brown. Let them cook for 3-5 minutes without moving them around, so they have a chance to begin the caramelization process.
    • Turn the mushrooms and onions over and reduce to medium heat and let them continue to cook for another 5-7 minutes. Stir them around during this part of the process..
    • While the mushrooms and onions are cooking, trim the leftover prime rib. Remove the bone and extra fat from the edges of the meat. Take out any fat deposits from the middle of the beef ( I took this picture before removing the piece of fat in the middle)
    • Sliced the baguette in half log ways so you make a top and bottom.
    • Slather a good amount of creamy horseradish sauce on the bottom side of french bread.
    • Add a good handful of arugula (the peppery flavor of arugula improves the overall flavor of the sandwich.
    • Place thinly sliced prime rib on top of the arugula ( I like to fold the meat, setting it side by side so it’s not just lying on top of each other).
    • Add the caramelized onions and mushrooms to the sandwich.
      *Add a few slices of provolone cheese (or swiss cheese) to the sandwich for additional flavor. If you want melted cheese, add the slices before the warm mushrooms and onions, and the heat will help melt the cheese
    • Cover with the top of the baguette and cut into sandwiches. Serve with hot au jus and extra horseradish sauce.

    Notes

    The sweet caramelized onions and mushrooms help make this the Best Prime Rib Sandwich. But if you’re not a fan of mushrooms? It’s okay to leave them out.
     

    Nutrition

    Calories: 533kcal | Carbohydrates: 35g | Protein: 25g | Fat: 32g | Saturated Fat: 13g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 13g | Cholesterol: 69mg | Sodium: 797mg | Potassium: 601mg | Fiber: 3g | Sugar: 7g | Vitamin A: 119IU | Vitamin C: 9mg | Calcium: 101mg | Iron: 4mg
    Tried this Recipe? Pin it for Later!Mention @askChefDennis or tag #askChefDennis!

    More Beef Recipes

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    About Chef Dennis

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    Chef Dennis is a semi-retired Chef, writer/blogger, photographer, recipe developer and creator of A Culinary Journey with Chef Dennis aka Ask Chef Dennis®. Chef Dennis worked professionally in White Table Cloth Restaurants for 40 years and has been developing easy to make, restaurant-style recipes since 2009. The second phase of his reinvention from chef to blogger has earned him a place at the Worlds Dinner Table. Join him on his Culinary Journey enjoying his easy to make Restaurant Style recipes and travel adventures. For more details, check out his About page.

    Reader Interactions

    Comments

    1. Elena Lopergolo Bush

      January 01, 2023 at 11:24 am

      5 stars
      Made this and it is delicious.

      Reply

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