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This Arbys roast beef sandwich copycat recipe delivers the iconic taste you know and love—tender, slow-roasted beef piled high on toasted buns, drizzled with savory au jus and topped with caramelized onions.
The secret lies in marinating the beef overnight for maximum tenderness, then slicing it thin enough to mimic that signature Arby's texture. Every bite should feel like a trip back to the drive-thru, but with the confidence of making it yourself.
The key to authenticity starts with the beef—thinly sliced roast beef that's been marinated in a blend of Worcestershire, garlic, and black pepper, then slow-roasted to perfection.
Meanwhile, the buns get a quick toast to lock in moisture, and the au jus is simmered until it's rich and glossy, ready to drizzle over the top. The caramelized onions add a sweet, crunchy contrast that balances the savory beef perfectly.
When you assemble this sandwich, the first bite should reveal that juicy, melt-in-your-mouth beef with layers of flavor from the au jus and onions. The toasted bun adds just the right crunch, while the horseradish mayo ties everything together.
This isn't just a copycat—it's a restaurant-quality sandwich you can make at home, every time.
Serve with crispy fries or a side of coleslaw for the full Arby's experience. The recipe scales easily, so whether you're feeding a crowd or just craving a classic, this method delivers the real deal. Let's get started on recreating that legendary taste.
Ingredients for arbys roast beef sandwich copycat
Pantry staples and a few specialty items transform into that iconic Arby's taste.
| Ingredient | Amount | Notes |
|---|---|---|
| Top Round Roast Beef 🥩 | 1 ½ lb | Thinly sliced against grain |
| Yellow Onions 🧅 | 2 large | Thinly sliced for caramelizing |
| Worcestershire Sauce 🍶 | 2 tbsp | A1 brand for authentic flavor |
| Garlic Cloves 🧄 | 4 cloves | Minced for marinade |
| Black Peppercorns 🌶️ | 1 tsp | Freshly cracked for marinade |
| Beef Broth 💧 | 1 cup | Low-sodium preferred |
| Horseradish Mayo 🥫 | ½ cup | Store-bought or homemade |
| White Vinegar 💧 | 1 tbsp | For au jus balance |
| Granulated Sugar 🍚 | 1 tbsp | For caramelized onions |
| Potato Buns 🍞 | 4 whole | Toasted until golden |
| Salt 🧂 | 1 ½ tsp | Kosher salt preferred |
| Olive Oil 🫒 | 2 tbsp | For caramelizing onions |
| Butter 🧈 | 2 tbsp | Unsalted for toasting buns |
The beef is everything—top round roast gives the right texture, but any lean cut works in a pinch. Costco or local butchers often have it pre-sliced, but if you're cutting it yourself, slice against the grain for that signature tenderness. For the Worcestershire, A1 brand is the gold standard—it's what Arby's uses. The onions? Yellow, not red—they caramelize better. Grab a couple large ones from the grocery store's produce section, and don't peel them until you're ready to slice.
No A1 Worcestershire? Substitute with 1 tbsp soy sauce plus 1 tsp molasses—it's not identical, but close enough. Running low on beef broth? Water plus 1 tsp beef bouillon powder works in a bind. The horseradish mayo can be swapped for regular mayo with 1 tsp prepared horseradish, though it won't be quite the same. For the caramelized onions, if you burn them, start over—patience is key here. The sugar helps, but it's the slow cooking that makes them sweet and glossy. And if you're feeling fancy, add a pinch of smoked paprika to the onions for depth.
Marinate the beef overnight—no skipping this step. The au jus can be made a day ahead and reheated gently. Store the beef in an airtight container in the fridge for up to 3 days, but it's best fresh. The caramelized onions keep for 5 days in the fridge, covered tightly. For the buns, toast them just before serving—they lose crispness fast. This recipe scales perfectly for a crowd, so double everything if you're feeding more than four. Leftovers? Wrap them tightly and freeze for up to 2 months—they reheat beautifully.
Why You'll Love This Recipe
- No-Fuss Prep: I swear, this recipe takes less effort than ordering delivery. Slice the beef, toss it in onions and Worcestershire, and let the oven do the work—no flipping, no fussing, just hands-off perfection.
- That Crispy-Soft Magic: The secret’s in the garlic and peppercorns—crispy edges on the outside, tender beef inside. Honestly, it’s the kind of bite that makes you reach for seconds without thinking.
- Leftovers That Don’t Suck: Make a big batch, and you’ll have sandwiches for days. The beef stays juicy when reheated, and it’s perfect for lunches or quick dinners—no sad, dried-out slices here.
- Budget Win: Top round roast is cheap, and a pound feeds a crowd. Between us, this is my go-to for game days or when the kids come home starving—delicious without breaking the bank.
Step-by-step instructions for Arbys-style roast beef sandwiches
Here's how to recreate Arbys' signature roast beef sandwich with that perfect au jus crust and caramelized onion layers.
Prepare the Marinade and Slice the Beef
In a small bowl, combine the 2 tablespoons Worcestershire sauce, 4 minced garlic cloves, 1 teaspoon freshly cracked black peppercorns, and 1.5 teaspoons salt. Mix well until the peppercorns are evenly distributed. Place the 1.5 pound top round roast beef in a resealable plastic bag and pour the marinade over it. Seal the bag and massage the marinade into the beef, coating it thoroughly. Let it marinate in the refrigerator for at least 4 hours or overnight for maximum flavor penetration.
Before cooking, remove the beef from the marinade and pat it dry with paper towels. Using a sharp knife, slice the beef thinly against the grain into ¼-inch thick slices. This slicing technique ensures each bite will be tender and easy to eat. Keep the sliced beef in the fridge until ready to use.
Caramelize the Onions
Heat 2 tablespoons olive oil in a large skillet over medium heat. Add the 2 large thinly sliced yellow onions and sprinkle with 1 tablespoon granulated sugar. Cook the onions for 15-20 minutes, stirring occasionally, until they develop a deep golden brown color and begin to caramelize. The sugar will help create that sweet, jammy texture that's key to the Arbys experience.
As the onions cook, they'll release moisture. Let it evaporate completely before stirring—this prevents steaming and ensures proper caramelization. You'll know they're ready when they smell intensely sweet and the edges are crispy. Remove the onions from the skillet and set them aside, leaving the caramelized bits in the pan for later.
Cook the Beef and Prepare the Au Jus
Return the skillet with the caramelized onion bits to medium-high heat. Add the sliced beef in a single layer and cook for 2-3 minutes per side until it's browned but still slightly pink in the center. This quick sear will give the beef that characteristic roast beef flavor without overcooking it.
Remove the beef from the skillet and set it aside. Pour in 1 cup beef broth and scrape up all the browned bits from the bottom of the pan. Bring to a simmer, then reduce heat to low and add 1 tablespoon white vinegar and 0.5 cup horseradish mayo. Stir well and let it simmer for 3-4 minutes until the sauce thickens slightly. This creates the signature au jus that will be drizzled over your sandwiches.
Toast the Potato Buns
While the au jus simmers, place the 4 whole potato buns cut-side down on a baking sheet. Brush the tops generously with 2 tablespoons melted butter and toast in a preheated 375°F oven for 8-10 minutes until they're golden brown and crispy. The butter adds richness and helps create that perfect crust.
Keep the buns warm while you assemble the sandwiches. If they cool too quickly, you can reheat them in the oven for 2-3 minutes to restore their crispiness. The toasted buns are the foundation of this sandwich—they need to be perfectly crisp to hold up to the juicy beef and au jus.
Assemble and Serve
Slice each potato bun in half and spread a generous layer of the horseradish mayo on both sides of the bottom half. Place ¼ of the sliced beef on each bun, followed by a layer of the caramelized onions. Spoon some of the au jus over each sandwich, allowing it to drip down the sides for that classic Arbys presentation.
Top with the remaining bun halves and serve immediately. The combination of tender beef, sweet caramelized onions, and that tangy au jus creates a sandwich that's as close to the original as you'll get at home. Each bite should deliver layers of flavor with every crispy, juicy mouthful.
Pro Tips For Making Arbys Roast Beef Sandwich Copycat
- Sear the Beef First: I used to skip this, but searing the top round slices in a screaming-hot pan for 30 seconds per side before slow cooking builds a flavor base that Worcestershire sauce alone can’t match. The crust locks in juices and gives that classic Arbys depth—don’t rush it, even if you’re impatient.
- Slice Against the Grain: Top round is tough when fibers run long, so slice it thin (¼-inch) and against the grain before cooking. I learned this after serving chewy beef—it’s the only way to get that tender, melt-in-your-mouth texture. Use a sharp knife or meat slicer if you’re feeling fancy.
- Soak Onions in Ice Water: Yellow onions burn easily in the sauce, and raw onions in sandwiches are a crime. Soak sliced onions in ice water for 10 minutes before draining, then pat dry. This mellows their sharpness and keeps them crisp—no more sad, mushy onions ruining your sandwich.
- Low and Slow for Hours: This isn’t a 30-minute weeknight hack. Cook the beef on low heat (275°F) for at least 3 hours, turning occasionally, until it’s fork-tender. I’ve tried rushing it, and the beef ends up dry or tough—patience here guarantees that Arbys-style meltiness. Cover loosely with foil to avoid drying out.
Serving suggestions for this arbys roast beef sandwich copycat
Classic Sides
No Arby's roast beef sandwich is complete without crispy golden fries—I recommend using frozen French fries (like Ore-Ida Golden Crinkles) for that signature texture. Toss them in 2 tablespoons vegetable oil, bake at 425°F for 20-25 minutes, and sprinkle with ½ teaspoon salt halfway through.
For a healthier twist, try oven-baked sweet potato fries with a pinch of smoked paprika. 🍟
Fresh Contrast
Add a cool, crunchy element to balance the richness. A creamy coleslaw with ½ cup mayo, 1 tbsp apple cider vinegar, 1 tsp sugar, and ½ cup shredded cabbage cuts through the beef beautifully.
For extra tang, add 1 tsp mustard and a pinch of celery seed. Serve chilled in a small bowl on the side. Alternatively, pickled cucumbers (store-bought or homemade) add a refreshing bite. 🥬
Dipping Sauces
Serve au jus in a small shot glass or ramekin for dipping—it’s the ultimate Arby’s touch. For variety, offer horseradish mayo (already in the recipe) and a spicy ketchup (mix ½ cup ketchup with 1 tbsp hot sauce and ½ tsp garlic powder).
Keep sauces in small squeeze bottles for easy serving. 🍅
Presentation Tips
Stack sandwiches high on a wooden board or metal tray for a rustic diner vibe. Use white paper-lined plates for a clean, classic look. For extra flair, drizzle au jus in zigzags over the top of the sandwich before serving.
Garnish with fresh parsley or black pepper for a pop of color. 💫
Meal Prep Hacks
Assemble sandwiches without the buns ahead of time—store beef, onions, and au jus in airtight containers for up to 3 days. Toast buns and assemble just before serving to keep them crispy.
For fries, par-cook and freeze—reheat in the oven for 5-7 minutes at 400°F. Prep coleslaw 2 days ahead for maximum crunch. 📅
Nutrition facts
Frequently asked questions
Can I use a different cut of beef instead of top round?
Yes, but top round is ideal for its lean texture. Use sirloin tip or bottom round as alternatives—they work well when sliced thin and marinated overnight. Avoid fatty cuts like ribeye, as they won't hold up to the thin slicing required for this recipe.
How do I get the au jus to be extra rich and glossy?
Simmer the au jus longer (up to 10 minutes) to reduce it and thicken the sauce. For extra richness, add 1 tablespoon of beef fat or 1 teaspoon of cornstarch slurry (mix cornstarch with cold water) to the simmering sauce. Stir constantly until it glistens.
Why is my beef tough instead of tender?
Tough beef usually means it wasn't sliced thinly enough or wasn't marinated long enough. Always slice against the grain into ¼-inch slices and marinate for at least 4 hours (overnight is best). If the beef is still tough, try cooking it slightly longer at a lower temperature to ensure full tenderness.
Can I make this sandwich ahead of time?
Assemble the sandwiches without the buns up to 3 days ahead and store in airtight containers. Toast the buns fresh and assemble just before serving to keep them crispy. The au jus and caramelized onions can also be made ahead—reheat gently before serving.
What’s the best way to reheat leftovers?
Reheat sandwiches in a 350°F oven for 5-7 minutes to restore crispiness. For the au jus, warm it in a small saucepan over low heat until bubbly, then stir in a splash of water if it thickens too much. Fries can be reheated in the oven at 400°F for 5 minutes to revive their crunch.