Copycat Arby’s Roast Beef Sandwich

A few years back I made a copycat of Arby’s Beef-n-Cheddar sandwich, one of my all-time favorites by a country mile. A commercial came on the tv a few days ago for Arby’s roast beef sandwiches, and I instantly started jonesin’ for one. As much as I loved my beef-n-cheddar copycat, I wanted to take a copycat of the roast beef sandwich to a new level. The level of true copycatness. And here it is. Tender, tasty thin-sliced beef. Tangy Arby’s sauce. Onion buns. And of course, seasoned curly fries. It’s impossible to make enough of it because no matter what, I’m going to make it disappear.
Copycat Arby's Roast Beef SandwichI actually used Sriracha ketchup for making the Arby’s sauce, and left out adding any additional hot sauce. It had some kick, and wasn’t 100% a copycat of the original, but it was fantastic. In fact, I’d recommend that Arby’s make a Sriracha version of the sauce for their restaurants. It’d be a big hit, trust me.

If you’re like me and you’re kind of addicted to Arby’s sauce, I’d double the amount below. If it’s not running down your forearm when you take a big bite of this copycat Arby’s roast beef sandwich, you’re not doing it right!

Also try my copycat of Arby’s beef-n-cheddar sandwich with curly fries.

Copycat Arby's Roast Beef Sandwich

Tender, tasty thin-sliced beef. Tangy Arby’s sauce. Onion buns. And of course, seasoned curly fries. It’s impossible to make enough of it because no matter what, I’m going to make it disappear.
Course Main
Cuisine American
Prep Time 15 minutes
Cook Time 8 hours
Total Time 8 hours 15 minutes
Servings 8 sandwiches
Calories 325kcal
Author Mike


For the roast beef

  • 24 ounces thin deli-sliced roast beef or use HIllshire Farm Ultra Thin Sliced Roast Beef sandwich meat
  • 1/2 cup water substitute beef broth for more beefy flavor
  • 1/2 cup brown sugar
  • 1 envelope onion soup mix I used 4 tablespoons of my homemade mix
  • 1 medium onion chopped
  • 1/2 teaspoon garlic powder
  • dash Worcestershire sauce
  • pinch kosher salt
  • pinch freshly ground black pepper

For the copycat Arby's sauce

  • 1/2 cup ketchup
  • 1 tablespoon apple cider vinegar
  • 1/4 cup water might need more
  • hot sauce to taste
  • 1/4 teaspoon onion powder
  • 1/4 teaspoon garlic powder
  • 2 tablespoons brown sugar
  • 1/4 teaspoon Kosher salt

For the sandwich build

  • 8 onion buns
  • Roast beef
  • Arby's sauce

For the curly fries

  • 1 28 ounce Ore-Ida Crispy Zesty Seasoned Curly Fries cooked per package instructions
  • 2 teaspoons paprika
  • 1 1/2 teaspoons Kosher salt
  • 1/4 teaspoon garlic powder
  • 1/4 teaspoons onion powder
  • 1/8 teaspoon cayenne pepper


For the roast beef

  • Place the roast beef in the bottom of a slow cooker.
  • Whisk together the remaining ingredients in a small bowl and pour over the roast beef.
  • Cover and cook on low for up to 8 hours, Stirring to get the meat in all of the liquid as it goes.

For the copycat Arby's sauce

  • Whisk together all ingredients.
  • Pour into a small saucepan over medium-low heat.
  • Cook for 20 minutes, stirring often.
  • Store any leftover sauce (which is unlikely) in the fridge for up to a week.

For the sandwich build

  • Warm or toast the buns if desired.
  • Pile the roast beef high on the buns and serve topped with the Arby's sauce with fries on the side.

For the curly fries

  • Bake fries per package instructions.
  • Transfer cooked fries to a large bowl.
  • Combine the remaining ingredients and sprinkle over the fries.
  • Toss gently to coat. Serve.


Calories: 325kcal | Carbohydrates: 47g | Protein: 24g | Fat: 5g | Saturated Fat: 1g | Cholesterol: 48mg | Sodium: 2548mg | Potassium: 429mg | Fiber: 2g | Sugar: 23g | Vitamin A: 130IU | Vitamin C: 42mg | Calcium: 341mg | Iron: 4mg

Nutritional values are approximate.

1 thought on “Copycat Arby’s Roast Beef Sandwich

  1. Pingback: 15 Best Copycat Recipes (Because Quarantine) - The Six Figure Femme

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