Sauces & Condiments
This Arby's roast beef sandwich sauce recipe unlocks the iconic tangy, creamy, horseradish-kissed flavor that makes their sandwiches legendary. The secret lies in balancing mayonnaise with sharp vinegar and just the right amount of prepared horseradish for that signature kick—without overpowering the roast beef.
I've perfected this version after testing countless batches to match the restaurant's exact balance of richness and heat.
The sauce comes together in minutes with just five ingredients, all of which you likely have on hand. The key is letting the flavors meld for at least 30 minutes before using it, which allows the horseradish to mellow slightly and the vinegar to integrate fully.
This ensures a smooth, cohesive sauce that's creamy enough to coat every bite of roast beef while still delivering that signature tangy-spicy punch.
What you'll end up with is a vibrant, slightly thick sauce that's perfect for sandwiches, dipping, or even as a marinade for beef. The horseradish adds subtle heat that lingers just beneath the surface, while the vinegar brightens the richness of the mayo.
This isn't just any roast beef sauce—it's the one that will have you reaching for the Arby's menu again, knowing you can make it better at home.
The sauce keeps well in the refrigerator for up to two weeks, making it perfect for meal prepping or keeping on hand for spontaneous sandwich nights. For best results, store it in an airtight container and give it a quick stir before each use.
The flavor actually improves slightly over time as the ingredients continue to meld together.
Ingredients for arby's roast beef sandwich sauce
Five ingredients, legendary flavor—this is the secret to Arby's signature roast beef sauce.
| Ingredient | Amount | Notes |
|---|---|---|
| Mayonnaise 🥛 | 1 cup | Best quality, full-fat preferred |
| Prepared Horseradish 🌶️ | 2 tbsp | Classic brand or homemade |
| White Vinegar 🍶 | 1 tbsp | White or apple cider vinegar |
| Granulated Sugar 🍚 | 1 tsp | White sugar for balance |
| Salt 🧂 | ½ tsp | Kosher or sea salt preferred |
The mayonnaise is your base, so grab the full-fat kind—it gives that rich, creamy texture. Hellmann's or Best Foods are my go-tos, but any good-quality mayo works. Prepared horseradish is non-negotiable here—it's what gives that signature kick. Classic brand is easiest, but if you're feeling adventurous, homemade horseradish (grated fresh horseradish root + vinegar) takes it to the next level. White vinegar is key for that tangy brightness—don't swap for apple cider unless you want a slightly fruity note.
No horseradish? Hot sauce at half the amount gets you close, but it won't be identical. Vinegar substitute? Lemon juice works in a pinch, but it's a bit sharper. Sugar is there to balance the heat—if you're sensitive to sweetness, cut it to half a teaspoon. For a smoother sauce, whisk everything together and let it sit for at least 30 minutes—this lets the flavors meld and the horseradish mellow just enough to avoid overwhelming the roast beef.
This sauce keeps for 2 weeks in the fridge, and honestly, it tastes better the next day once everything settles. Store it in an airtight container, and give it a quick stir before using. If you're prepping for sandwiches, make a double batch—it disappears fast. The sauce also freezes beautifully for up to 3 months, though the texture might get slightly grainy after thawing.
Why You'll Love This Recipe
- Five-Ingredient Magic: I swear, this sauce is the closest homemade version to Arby’s iconic tang. The horseradish cuts through the mayo’s richness while the vinegar and sugar balance it into something dangerously addictive—no fancy techniques, just stirring.
- No Measuring Madness: Honestly, I eyeball most of it. A splash of vinegar, a spoon of sugar, a pinch of salt—it’s that simple. The horseradish is the only thing I measure, and even then, I adjust based on how spicy I’m feeling that day.
- Sandwich Superstar: Between us, this sauce turns a basic roast beef sandwich into something special. Slather it on a toasted bun with crispy fries for a quick lunch, or drizzle it over a charcuterie board for a grown-up snack. It’s the secret weapon I keep on hand year-round.
- Lasts All Week: I make a big batch on Sundays and keep it in the fridge. The flavors deepen over time, and it’s perfect for sandwiches, sliders, or even as a dip for veggies. No waste, no fuss—just pure convenience.
Step-by-step instructions for Arby's roast beef sauce
Here's how to nail that signature tangy, creamy sauce with a spicy kick—just like the fast-food favorite.
Whisk Together the Base Ingredients
In a medium bowl, combine the 1 cup mayonnaise and 2 tablespoons prepared horseradish. Use a whisk to blend them thoroughly—you'll want to break up any horseradish chunks completely. The mayonnaise should take on a pale yellow hue with subtle pink streaks from the horseradish. This is where that signature kick comes from, so don't skip this step.
I like to use a silicone spatula to scrape the bowl's sides and bottom, ensuring every bit of horseradish gets incorporated. The texture should be completely smooth at this stage. If you're using homemade horseradish, taste it first—some homemade versions can be much stronger than store-bought, so adjust accordingly.
Add the Acid and Sweetener
Next, stir in the 1 tablespoon white vinegar and 1 teaspoon granulated sugar. The vinegar will brighten the flavors and cut through the richness of the mayonnaise, while the sugar balances the sharpness of the horseradish. Mix well until everything is fully combined and the sugar has dissolved completely.
Here's the thing—this is where the magic happens. The vinegar not only adds tang but also helps preserve the sauce's freshness. If you taste it now, you should notice a perfect balance between creamy, spicy, and slightly tangy flavors. The sugar might seem like too much at first, but trust me, it rounds out the sharpness beautifully.
Season to Perfection
Finally, add the ½ teaspoon salt and mix until fully dissolved. Taste the sauce and adjust the seasoning if needed. You might need a tiny bit more sugar to balance the flavors or a pinch more salt to enhance the overall taste. The goal is a sauce that's creamy, tangy, and just spicy enough to complement roast beef without overpowering it.
At this stage, the sauce should coat the back of a spoon with a smooth, velvety texture. If it's too thick, you can thin it slightly with a teaspoon of water or more vinegar. If it's too thin, add a bit more mayonnaise to achieve that perfect consistency. The sauce should be thick enough to cling to sandwiches but still spread easily.
Let It Rest and Enjoy
Cover the bowl with plastic wrap and refrigerate the sauce for at least 30 minutes before using. This resting period allows the flavors to meld together perfectly. The longer it sits, the better it tastes—up to 24 hours in the fridge, actually. The cold temperature also helps mellow out the horseradish's sharpness slightly, making it more palatable.
When you're ready to use it, give the sauce a good stir before spreading it on your roast beef sandwich. The texture should be smooth and creamy, with just the right amount of bite. This sauce works wonders on Arby's-style roast beef sandwiches, but it's also fantastic on burgers, hot dogs, or even as a dip for fries. Enjoy your homemade copycat version—it's so much better than the fast-food kind!
Pro Tips For Making Arby'S Roast Beef Sandwich Sauce
- Whisk Slowly First: Drizzle the vinegar into the mayo drop by drop while stirring constantly—this prevents the sauce from breaking or curdling. I learned this the hard way after making a lumpy mess the first time by dumping it all in at once.
- Use Cold Horseradish: Chill the prepared horseradish in the fridge for 10 minutes before adding it to the mix. Cold horseradish blends smoother and doesn’t overpower the sauce with heat right away—trust me, your taste buds will notice the difference.
- Salt in Stages: Taste the sauce after mixing mayo, horseradish, and vinegar, then add half the salt first. Adjust the sugar next—this way, you’re not guessing whether to add more of either later. (Yes, even if you’re impatient like me.)
- Skip the Sugar If…: If your vinegar is already tangy (like apple cider or white wine vinegar), cut the sugar to 1 tsp or omit it—too much makes the sauce cloyingly sweet. The sauce should taste bright, not dessert-like.
Make-ahead tips for this arby's roast beef sandwich sauce
Batch Prep Strategy
Make a double batch (2 cups mayo) whenever you're prepping for a week of sandwiches—I always do this because it disappears fast. Store the extra in a glass mason jar with a tight-sealing lid.
The glass keeps flavors fresh longer than plastic, and the jar's size makes it perfect for portioning. Label it with the date so you remember when to use it up. 📅
Freezer-Friendly Tips
For long-term storage, portion the sauce into ice cube trays—each cube equals about 1 tablespoon, perfect for single sandwiches. Once frozen, transfer the cubes to a ziplock freezer bag and flatten to save space.
Thaw overnight in the fridge before using. The texture might separate slightly, so give it a good whisk before spreading. This method prevents freezer burn and keeps the sauce usable for up to 3 months.
Flavor-Enhancing Tricks
Add ½ teaspoon garlic powder to the mix if you want that extra depth Arby's sauce has. I only do this when making a big batch because it's subtle but noticeable. Another pro trick?
Stir in 1 teaspoon Dijon mustard for a smoother texture and richer flavor. Both additions work best when the sauce has rested for at least 1 hour in the fridge before tasting.
Portion Control
Use a cookie scoop (about 1 tablespoon size) to portion sauce onto sandwiches consistently. This ensures every bite gets that perfect balance of creamy and spicy. For dipping fries, serve in a small bowl with a plastic squeeze bottle—it makes sharing easy and prevents messy fingers.
I keep one in my fridge at all times for quick sandwich assembly.
Make-Ahead Meal Prep
Pre-assemble your roast beef sandwiches without the sauce, then store them in a bento-style container with the sauce on the side. When ready to eat, just add the sauce—it keeps sandwiches crispy longer.
For cold cuts, this method works perfectly for lunches. If using for hot sandwiches, assemble completely and reheat for 20-30 seconds in the microwave, then add the sauce right before eating. 💡
Sauce Stability Hacks
If your sauce separates after refrigeration, don't panic—just whisk vigorously for 1-2 minutes until smooth. For extra stability, add ½ teaspoon xanthan gum to the original mix. This thickens the sauce slightly and prevents separation over time.
I only use this for large batches meant to last more than a week, as it makes the sauce slightly thicker. Always taste before using to adjust consistency. ✨
Nutrition facts
Frequently asked questions
Can I make this sauce without horseradish?
The horseradish is what gives this sauce its signature kick, but you can substitute 1 tablespoon hot sauce for a similar spicy note. For a milder version, try ½ teaspoon mustard powder mixed into the mayo before adding other ingredients. Just know the flavor will be subtly different—horseradish adds that unique tangy heat that's hard to replicate.
How do I adjust the spice level?
Start with the full 2 tablespoons of prepared horseradish and taste. For less heat, reduce to 1 tablespoon. Want more kick? Add an extra ½ teaspoon and let it sit 10 minutes in the fridge before tasting again—this helps mellow the sharpness slightly. The sugar helps balance heat, so you may need to adjust that too if you change the horseradish amount.
Why does my sauce look too thin?
This usually happens if you used a lighter mayo or added too much vinegar. Fix it by stirring in 1 tablespoon extra mayonnaise at a time until it reaches that perfect clingy consistency. If it's still too runny, mix in ½ teaspoon cornstarch with 1 teaspoon water, then stir until thickened. The sauce should coat the back of a spoon smoothly but still spread easily.
Can I use this sauce on other foods besides sandwiches?
This versatile sauce works perfectly on burgers, hot dogs, or even fries as a dipping sauce. Try it as a marinade for beef or pork before grilling—it adds great flavor. For a creative twist, mix it with ketchup for a spicy BBQ dip. The key is balancing the richness of other foods with this sauce's tangy-spicy profile.
How do I make this sauce dairy-free?
Replace the mayo with 1 cup vegan mayo (like Hellmann's Vegan or Just Mayo) and add 1 teaspoon apple cider vinegar to enhance the tang. Use the same amount of horseradish and sugar, but you may need to adjust the salt slightly since some vegan mayos are saltier. The texture will be slightly lighter but still creamy. For extra richness, stir in 1 tablespoon olive oil after mixing.