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    Home » Recipes » Leftover Prime Rib Sandwich Recipe

    Leftover Prime Rib Sandwich Recipe

    Dec 5, 2018 · Modified: Sep 3, 2020 by Mackenzie Ryan · This post may contain affiliate links | Disclosure policy in footer.

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    Three prime rib sandwiches on baguettes. Recipe title above it is on a blue background.

    Whether you are celebrating a holiday like Thanksgiving or Christmas, or you're just feeling fancy, prime rib makes an amazing meal. Don't let any of it go to waste by making this leftover prime rib sandwich recipe. It doesn't feel heavy after a fancy meal and will satisfy everyone. 

    overhead image of two assembled leftover prime rib sandwiches next to a bowl of caramelized onions and roasted garlic

    Prime rib sandwiches are a great way to enjoy leftovers. They're quick to assemble, but flavorful and satisfying. Make them more gourmet with a slightly tangy horseradish sauce that will make you completely okay with not having au jus.

    How Long Are Prime Rib Leftovers Good For?

    Prime rib leftovers are best eaten within two to three days of cooking. However, with a good airtight container, they will stay fresh in the refrigerator for up to five days. The more well done your prime rib is when you refrigerate it, the longer it will last. If you roast your prime rib to the typical rare to medium rare, potential bacteria has a better chance of growth. It’s one of those situations of being better safe than sorry. Make this prime rib sandwich recipe sooner than later.

    close up of caramelized onions on top of open face prime rib sandwich

    How To Use Prime Rib Leftovers

    Since a prime rib roast is such a pricey cut of beef, you want all of the leftovers to be relished. One of my favorite ways is a prime rib sandwich. If I feel lazy, I can eat it cold. If I feel more gourmet, a quick toasting under the broiler makes a crusty hot sandwich. Another reason I love making this prime rib sandwich is that it doesn’t overcook your leftovers. Many leftover prime rib recipes cook it beyond the beautiful rare to medium rare doneness you worked so hard for. This one, however, focuses on retaining it. Even if you choose to make your sandwich hot, the broiler keeps the cook time as brief as possible.

    Tips For Making The Best Prime Rib Sandwich with Horseradish Sauce

    Prime rib and horseradish sauce are a classic pairing. This horseradish sauce on this prime rib sandwich however has a slight variation. It is subtly muted by sour cream, while getting a flavorful boost from the roasted garlic. The secret ingredient though is the white balsamic. It’s there to just lightly boost the brightness of the sauce and allow the flavors to shine through. (Like lemon juice with berries.)  If you really want to go above and beyond, these culinary skills and techniques will take your prime rib sandwich to a new level.

    • How To Make Roasted Garlic.  This goes through the details of how to make roasted garlic perfectly. If you overcook it, it is hard to remove from the head. If you undercook it, it doesn’t bring enough flavor to the horseradish sauce. Make sure you get it right.
    • Make Perfect Caramelized Onions.  Perfectly done caramelized onions leave nothing behind in the pan and have no scorch marks. Find out how to control your cooking so that your caramelized onions have excellent flavor AND texture.

    If you know you are going to make this prime rib sandwich recipe, I recommend making your roasted garlic and caramelized onions ahead. That way you don’t spend multiple days hanging out in your kitchen.

    Two assembled prime rib sandwiches on a wooden board

    Leftover Prime Rib Sandwich Recipe

    If you want to make this prime rib sandwich hot, I recommend using your broiler on a medium or low setting. (If your broiler has settings.)  Assemble the sandwiches without the baby kale and place them on a baking sheet. Cook them in the middle of the oven for two to three minutes, or until heated through. After you’ve removed them from the oven, carefully open the sandwich and add the greens. The residual heat from the sandwich will warm them up for you.


    Want a free printable grocery list for this leftover prime rib sandwich recipe? Get it HERE. 


    Use this grocery list to help simplify shopping. Everything is listed in standard grocery store amounts. If no size is specified, even the smallest package will provide more than enough.

    Happy Cooking! 🙂

    a hand grabbing a prime rib sandwich off of a wooden board
    5 from 14 votes

    Prime Rib Sandwich with Horseradish Sauce

    Use your prime rib leftovers to make the ultimate sandwich.  With a rich and tangy horseradish sauce, and sweet caramelized onions, you won't want to stop eating it.
    Course: Sandwiches & Wraps
    Cuisine: American
    Author: Mackenzie Ryan
    4 servings
    Prep Time: 10 minutes
    Cook Time: 45 minutes
    Total Time: 55 minutes
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    Ingredients

    • 2 large sweet yellow onions, peeled and sliced
    • 4 Tablespoons butter
    • 1 baguette
    • 1 pound cooked prime rib roast, sliced thin
    • 2 cups baby kale, or other leafy green

    Horseradish Sauce

    • ½ cup sour cream
    • 1 Tablespoon cream style horseradish
    • 1 teaspoon white balsamic
    • 3 heads roasted garlic
    • olive oil, as needed
    • 1 Tablespoon fresh thyme
    • salt and pepper , to taste

    Instructions

    • Preheat the oven to 425°F.  Cut the top off of the garlic heads and drizzle them lightly with olive oil.  Place them on some aluminum foil and fold the foil into a packet.  Roast for 45 minutes, or until the cloves are caramelized and starting to come out of the head. Open the foil packet and let the garlic cool to room temperature. Remove the cloves from the head.
    • In a large skillet over medium heat, melt the butter and add the onions. Reduce the heat to low and cook until the onions are golden brown, stirring occasionally.  When done correctly, this should take about 30 minutes.  Let cool to room temperature.

    Horseradish Sauce

    • In a blender or food processor, add the sour cream, balsamic, roasted garlic cloves and horseradish cream.  Pulse until the roasted garlic is incorporated.  Stir in the fresh thyme and season with salt and pepper, adding any extra horseradish cream to your preference.  Set aside.

    Prime Rib Sandwich

    • Remove the ends from the baguette and cut it into four equal pieces; about four inches long.  Carefully slice horizontally into the bread (but not all the way through) to open it up.
    • Slather the inside of the baguette with the horseradish sauce.  Place a layer of baby kale, followed by 4-6 thin slices of prime rib.  Dollop caramelized onions on top and add some fresh cracked black pepper.  Close the baguette around the sandwich and serve.

    Notes

    You can save yourself time by making the caramelized onions while the garlic roasts.  They both should finish around the same time.

    Nutrition

    Serving: 1serving | Calories: 377kcal | Carbohydrates: 43g | Protein: 9g | Fat: 19g | Saturated Fat: 11g | Cholesterol: 45mg | Sodium: 538mg | Potassium: 377mg | Fiber: 2g | Sugar: 2g | Vitamin A: 3960IU | Vitamin C: 50.7mg | Calcium: 179mg | Iron: 3mg
    Tell me how much you love this recipeand show off how you made it!
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    Reader Interactions

    Comments

    1. Marisa Franca says

      December 10, 2018 at 10:36 am

      5 stars
      Now that is what I call a sandwich! That is something you'd find at a fine restaurant. We love our prime rib but with all the males in the family we don't have leftovers. What we can doo is follow the recipe and when we have a part of a beef roast leftover we'll cut it paper thin. And with beef, horseradish is a must!!

      Reply
      • Mackenzie Ryan says

        December 11, 2018 at 9:40 am

        I definitely can relate to not having many leftovers. Every year it seems like I buy a larger and larger prime rib in hopes of leftovers, but rarely get enough!

        Reply
    2. Debra says

      December 10, 2018 at 8:44 am

      5 stars
      Perfect caramelized onions make everything taste better! YUM. Thanks for the link on that. I totally appreciate this post. We will definitely have some prime rib left over and this will definitely make the troops happy. It's a very elevated sandwich over what I would slop together the following day. They will love this.

      Reply
      • Mackenzie Ryan says

        December 11, 2018 at 9:40 am

        I absolutely agree about the caramelized onions! I hope they all love it!

        Reply
    3. Traci says

      December 10, 2018 at 8:40 am

      5 stars
      You can't believe how much I wish I had this for breakfast right now! Then again, I bet you can! 🙂 Prime rib sandwiches are one of my favorites in the sammie world! You have captured the medium rare awesomeness that I love and long for when I'm craving a prime rib sandwich. Way to go! And I love it that you used baby kale with it...pro move! Pinning, bookmarking, all the things! 🙂

      Reply
      • Mackenzie Ryan says

        December 11, 2018 at 9:43 am

        I would totally eat a prime rib sandwich for breakfast! Why have I never thought of that before?!?!

        Reply
    4. Daniela says

      December 10, 2018 at 7:59 am

      5 stars
      This prime rib sandwich looks absolutely delicious! And my husband would love that horseradish sauce. I was a bit worried about all the work involved in roasting the garlic and caramelizing the onion, but if you make those two components ahead of time as you suggest, assembling this sandwich should be a breeze. Great recipe!

      Reply
      • Mackenzie Ryan says

        December 11, 2018 at 9:44 am

        Yes! The last thing you want to do is slave away in the kitchen after a big day of slaving away. Making them ahead is such a simple task, but really makes this prime rib sandwich amazing!

        Reply
    5. Trish says

      December 10, 2018 at 7:44 am

      5 stars
      I'm definitely all about the prime rib sandwich, YUM! You're right about the classic horseradish, but I'm so into the roasted garlic and grilled onions you've got going on too. Totally genius. 🙂

      Reply
      • Mackenzie Ryan says

        December 11, 2018 at 9:46 am

        The roasted garlic and caramelized onions help provide a sweetness that balances the tangy horseradish sauce so nicely. It makes it taste super gourmet without adding anything too fancy.

        Reply
    6. Tracy says

      December 09, 2018 at 9:06 pm

      5 stars
      Thanks for the info on how long the prime rib will last. I'm never quite sure. But this sandwich, wow. Talk about a way to make it a tough call which is better - the original meal for the leftover sandwich!!

      Reply
      • Mackenzie Ryan says

        January 08, 2019 at 9:00 am

        I get so nervous about things like how long prime rib is good for, too. Especially when I cook it rare. Guidelines make it so much easier to gauge and make appropriate choices.

        Reply
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