Prime Rib Tacos with Avocado Horseradish Sauce

Prime Rib Tacos are the best way to use leftover prime rib. With avocado horseradish sauce and caramelized onions they are taco perfection. 

My shrimp taco recipe is one of the most popular on my blog but every once in a while I like to switch things up.

While I was testing prime rib recipes, I found myself with a lot of left over prime rib. Terrible right? Yeah, I know. It’s a tough job I’ve got. :)

But all my leftovers got me thinking that those of you that are making prime rib for your Christmas feast might have some leftovers too and might be looking for something to do with them.

Well look no further, these Prime Rib Tacos with Avocado Horseradish Sauce are the perfect way to use your prime rib leftovers.

When I was thinking about what kind of thing to make with the leftovers, I was thinking that I wanted to do something nontraditional.

Something completely different because I don’t know about you but when December 26th rolls around, I’m ready for anything and everything but traditional American food.

So I thought tacos.

Because… tacos.

It is always a good time for tacos. Especially on December 26th because in my mind, once Christmas is over it should be summer. Really. The year should just go from May to December and then repeat.

I say this only because Seattle in the Winter is just so blah. It doesn’t snow. The sun doesn’t shine. It’s just gray. And cloudy. And rainy. And leaves me longing for warm summer days when I’ve got an ice cold corona in one hand and a taco in the other.

These tacos won’t make the calendar jump ahead 6 months but they might just bring a little bit of brightness to these early winter days. And while I should say that the prime rib is the star because, after all, it is prime rib, the avocado horseradish sauce steals the show. It’s creamy, citrusy and has the perfect amount of kick. I can already tell it’s a sauce I’ll be making all year long.

Prime Rib Tacos with Avocado Horseradish Sauce Recipe

Serves 4 Prep Time: Cook Time:

Taco Ingredients:

  • 1 tablespoon olive oil
  • 1/2 onion, sliced
  • 2 cloves garlic, chopped
  • 2 cups sliced, cooked prime rib
  • 8 taco shells
  • oil for frying
  • 1/4 cup cilantro

Avocado Horseradish Sauce

  • 1 avocado, pitted and removed from skin
  • 2 cloves garlic
  • 2 tablespoons lemon juice
  • 1 teaspoon prepared horseradish
  • 1/4 teaspoon salt



Start by preparing the avocado horseradish sauce. Place avocado, garlic, lemon juice, horseradish and salt together in a food processor. Process until smooth. Transfer to a bowl, cover and refrigerate while you prepare the tacos.


Heat olive oil in a skillet over medium heat. Cook unions until softened, about 3 minutes. Stir in garlic and sliced prime rib. Cook just until the prime rib is warmed through. Transfer to a plate, cover with aluminum foil to keep warm.


In the same skillet you cooked the meat, heat a thin layer of oil. Fry a taco shell, 30 seconds on each side and transfer to a paper towel lined plate. Repeat with remaining taco shells.


To assemble a taco, place a spoonful of prime rib mixture in the middle of a shell. Spoon avocado sauce on top. Sprinkle with cilantro. Repeat with remaining ingredients. Serve.



Leave a Comment

  • Reply
    Danielle Green
    December 29, 2017 at 11:20 am

    These simply look amazing!

  • Reply
    Sweet Basil
    December 29, 2017 at 9:52 am

    We love horseradish and that sauce sounds like the absolute perfect way to top a prime rib taco!

  • Reply
    December 29, 2017 at 6:38 am

    I completely agree about winter ending with Christmas! I think these tacos will do a good job making me forget the frozen tundra I live on for a while though ;-)

  • Reply
    Betsy @ Desserts Required
    December 28, 2017 at 5:51 pm

    My mouth is watering just looking at this!

  • Reply
    Allison Miller
    December 27, 2017 at 1:26 pm

    A prime rib taco sounds like the best idea ever!

  • Reply
    Derek Deen
    December 26, 2017 at 5:33 pm

    This is a must try! We just tried this tonight with Christmas leftovers and this in my wife’s words is the best leftover idea yet! Thanks for sharing

    • Reply
      December 27, 2017 at 9:07 pm

      I am so happy to hear that Derek! It is one of our favorite ways to use leftover prime rib too!

  • Reply
    Jill S
    July 20, 2016 at 7:25 pm

    These were so very tasty! We added some yellow bell peppers to the sautéed onions and added some lettuce and sharp white cheddar to the toppings. Delish.

    • Reply
      Des @ Life's Ambrosia
      July 21, 2016 at 2:34 pm

      Yay! I am so happy to hear that you like them and I LOVE the sound of adding some sharp white cheddar. Yum!

  • Reply
    Cheryl Benecke
    June 23, 2015 at 4:52 am

    I am making these tonight. Can’t wait to try them. Will report back. I had left over prime rib from Father’s Day and Googled recipes for left over prime rib and yours was the first to pop up. Looks fabulous! Thank you! Love your blog too. I will be following you from now on. Oh and brilliant photos by the way, thanks to your hubby as you mentioned. We certainly eat with our eyes first.

  • Reply
    Laura T
    February 24, 2015 at 8:46 pm

    These are brilliantly inventive! What a great way to make sure extra meat does not go to waste. And I love the horseradish with the beef–such a classic combo and for good reason!

  • Reply
    February 24, 2015 at 8:03 pm

    These are my kind of tacos! I want one RIGHT NOW.

  • Reply
    Nibbles By Nic
    February 24, 2015 at 6:38 pm

    Wow, is this pretty!! I love the fried taco shell idea!! How creative :-)

  • Reply
    Brandy M
    February 24, 2015 at 10:06 am

    We do taco Tuesday a lot, this would be a great change of pace from what we usually have! Thank you for sharing it.

  • Reply
    Heather //
    February 24, 2015 at 5:47 am

    Seriously, there is no other explanation needed than…tacos! These sound absolutely perfect…I need a few.

  • Reply
    Rachel Cooks
    February 24, 2015 at 3:59 am

    You had me at prime rib! The fried taco shell and the sauce are totally icing on the cake! Wowza.

  • Reply
    February 24, 2015 at 12:37 am

    haha I absolutely love this! ;) we do this all of the time! This is so perfect to lighten up these dark, dreary, winter days! Plus, as a first time visitor to your blog, I absolutely love the layout and everything, it is so easy to navigate and so pleasing to the eye!

    • Reply
      February 24, 2015 at 9:33 pm

      Thank you Alice!

  • Reply
    Karen @ The Food Charlatan
    December 19, 2014 at 11:28 am

    I have to try that avocado horseradish sauce!! Also, I’m so with you. Let’s just skip January-April.

  • Reply
    Heather @FrenchPress
    December 19, 2014 at 7:53 am

    I am SO looking forward to our prime rib leftovers now

  • Reply
    December 19, 2014 at 5:24 am

    Prime rib tacos?! I am sold!

  • Reply
    December 19, 2014 at 4:57 am

    These look amazing! We’re huge fans of beef in my house, we’ll definitely be making these soon!