Slow Cooker Roast Beef Sandwiches

by Sabrina Snyder

Published on Last updated

22 Comments

4 sandwiches
Prep Time 10 minutes
Cook Time 5 minutes
Total Time 15 minutes
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Slow Cooker Roast Beef Sandwiches with homemade horseradish that take less than two hours from start to finish and taste amazing!

This recipe takes my super easy Slow Cooker Roast Beef and turns it into the best sandwiches ever with my horseradish dressing! Seriously, you will think they came from a fancy bistro, they are SO good!

Sabrina’s Slow Cooker Roast Beef Sandwiches

When I first created this site, I was so excited to bring readers my easy, crazy tender slow cooker recipe for roast beef! I love that you can cook beef so evenly and perfectly in a crockpot – the crust is amazing, and the meat is cooked to a perfect medium temperature. It quickly became a top recipe, followed by this delicious sandwich to serve the leftovers. Years later, both recipes remain reader (and personal) favorites and for good reason! You can always make these sandwiches with thick-cut deli roast beef, but if you can, you should definitely try them with homemade roast beef too. Follow the link in the recipe card for the meat or see the abridged directions below in this post.

Recipe Card

Dinner, then Dessert

Slow Cooker Roast Beef Sandwiches

Slow Cooker Roast Beef Sandwiches with homemade horseradish that take less than two hours from start to finish and tastes amazing!
Yield 4 sandwiches
Prep Time 10 minutes
Cook Time 5 minutes
Total Time 15 minutes
Course Dinner
Cuisine American
Author Sabrina Snyder
Holding assembled sandwich closeup
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Ingredients
 

  • 2 pounds Slow Cooker Roast Beef , thinly sliced
  • 4 bakery style hoagie rolls
  • 2 tablespoons butter
  • lettuce
  • tomatoes sliced
  • 2 tablespoons prepared horseradish
  • 1 tablespoon cider vinegar
  • 1/4 cup  mayonnaise
  • 1/2 cup sour cream

Instructions

  • In a small bowl add the prepared horseradish, cider vinegar, mayonnaise and sour cream and mix well.
  • Butter the buns and put them into the toasted oven to toast.
  • Spread the horseradish sauce onto the rolls.
  • Layer on the lettuce and tomatoes.
  • Top with Roast Beef slices and and the top roll.

Nutrition

Calories: 650kcal | Carbohydrates: 34g | Protein: 55g | Fat: 32g | Saturated Fat: 11g | Cholesterol: 165mg | Sodium: 3899mg | Potassium: 694mg | Fiber: 1g | Sugar: 6g | Vitamin A: 355IU | Vitamin C: 104.2mg | Calcium: 677mg | Iron: 15.5mg

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Table of contents

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More About this Recipe:

You may be wondering why this post is separate from my original slow cooker roast beef recipe. Well, for a couple of reasons. The serving style is different here since it is sliced thinly and served at room temperature versus served plated with sides like prime rib. Secondly the horseradish dressing didn’t fit in the original recipe card. And finally, I just wanted this beautiful sandwich with its amazing sauce to get its day in the sun! I hope you enjoy it as much as I do!

Chef’s Note: Horseradish

So, let’s talk horseradish for a moment. I love keeping horseradish in the fridge because it adds a huge punch of flavor to my sandwiches. I don’t use the horseradish “pure,” though. I have been a bit of a spice wimp since I had kids, so I mix my horseradish with mayonnaise and sour cream to mellow it out. The recipe for the horseradish in this sandwich is actually for a horseradish “sauce,” which takes prepared horseradish and mellows it out. You can, of course, use the prepared horseradish on the sandwich alone, too.

Slow Cooker Roast Beef

Time needed: 1 hour and 30 minutes

  1. Season

    Rub a 5 lb chuck roast with 2 teaspoons salt, ½ teaspoon pepper and 2 cloves of minced garlic.

  2. Heat Oil

    Heat a large pot over high heat with 1 tablespoon of vegetable oil.

  3. Sear

    Sear the beef of on all sides, about 3-4 minutes on each side.

  4. Transfer

    Transfer the meat and the drippings to the slow cooker insert.

  5. Cook

    Cook on low heat with the lid for 90 minutes.

How to Assemble Sandwiches

  • Add the prepared horseradish, cider vinegar, mayonnaise, and sour cream in a small bowl and mix well.
  • Butter the buns and put them into the toasted oven to toast.
  • Spread the horseradish sauce onto the rolls.
  • Layer on the lettuce and tomatoes.
  • Top with Roast Beef slices and the top bun enjoy.

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More Tasty Slow Cooker Sandwiches

Collage of assembled sandwich and slices of roast beef.
Collage of making sandwich and beef slices.
Sandwich held upright with recipe name over center.
Assembled sandwich held upright with recipe name over center.

About the Author: Sabrina Snyder

Sabrina is a professionally trained Private Chef of over 10 years with ServSafe Manager certification in food safety. She creates all the recipes here on Dinner, then Dessert, fueled in no small part by her love for bacon.

Sabrina Snyder is a professionally trained personal and private chef of over 10 years who is the creator and developer of all the recipes on Dinner, then Dessert.

She is also the author of the cookbook Dinner, then Dessert – Satisfying Meals Using Only 3, 5 or 7 Ingredients, published by Harper Collins.

She started Dinner, then Dessert as a business in her office as a lunch service for her coworkers who admired her lunches before going to culinary school and becoming a full time personal chef and private chef.

As a personal chef Sabrina would cook for families one day a week and cook their entire week of dinners. All grocery shopping, cooking and cleaning was done along with instructions on reheating. As a private chef she cooked for private parties and cooked in family homes in the evenings for families on a nightly basis after working as a personal chef during the day.

Sabrina has been certified as a ServSafe Manager since 2007 and was a longstanding member of the USPCA Personal Chef Association including being on the board of the Washington DC Chapter of Chefs in the US Personal Chef Association when they won Chapter of the year.

As a member of the community of food website creators Sabrina Snyder has spoken at many conferences regarding her experiences as a food writer including the Indulge Food Conference, Everything Food Conference, Haven Food Conference and IACP Annual Food Professionals Conference.

Sabrina lives with her family in sunny California.

See more posts by Sabrina

Dinner, then Dessert, Inc. owns the copyright on all images and text and does not allow for its original recipes and pictures to be reproduced anywhere other than at this site unless authorization is given. Read my disclosure and copyright policy. This post may contain affiliate links.

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Comments

  2. Excuse my ingnorance ? But do you serve the meat on this warm or chilled? Thank you! Looks delish! This will be our Father’s Day meal this year for sure! 

    Reply

    1. I served mine at room temperature but you can serve it any way you’d like 🙂 This will be perfect for Father’s Day!!

      Reply

    1. Yes, I have a recipe for Slow Cooker Roast Beef (Sliceable!). Enter that into the search bar and it’ll take you there. The recipe so easy and comes out perfect!

      Reply

    1. I let the roast beef cook on low for 90 minutes after searing the beef for about 3-4 minutes per side.

      Reply

  6. That horseradish sauce is everything! I simply cannot eat roast beef without horseradish and I am now craving this sandwich big-time.

    Reply

  8. I am such a sandwich girl…I think I need to try this. And I have to mellow out horseradish too….it’s just too strong for me.

    Reply

  9. This sandwich looks so sooo amazing! I love mayonnaise and roast beef sandwich! Is the best!

    Reply

  11. One of my very favorite flavor combinations is roast beef at horseradish. Can’t wait to try this one!

    Reply

  12. Nope. Just nope. I’m not gonna make it because I know I won’t be able to handle all the awesomeness! 😛

    Reply