Copycat Arby’s Horsey Sauce
Most people who try to make Arby’s Horsey Sauce at home load it up with horseradish. The result is sharp, biting, and nothing like the restaurant version — because the real Horsey Sauce is not a horseradish sauce. It’s a sweet, creamy sauce with a mild horseradish note.
Look at the actual ingredient list from the retail bottle: Soybean Oil, Water, High Fructose Corn Syrup, Distilled Vinegar, Corn Syrup, Modified Corn Starch, Egg Yolks, Salt, Mustard Flour, Horseradish Powder. HFCS is the third ingredient. Horseradish Powder is near the bottom, in the “contains 2% or less” group. This is a sweet-tangy emulsified sauce that tastes like horseradish, not a horseradish preparation that happens to be creamy.
That’s the whole recipe. Nail the sweetness and keep the horseradish light, and you’ll have something that actually tastes like what comes in those little packets.
TL;DR
Stir together 1/2 cup mayo, 2 tablespoons creamed horseradish, 1.5 teaspoons sugar, 1 teaspoon white vinegar, 1/4 teaspoon yellow mustard, and a pinch of salt. Rest 30 minutes in the refrigerator. Makes about 1/2 cup; keeps 7 days.
Why Most Copycats Get It Wrong
Too much horseradish. Walk into any Arby’s and taste a packet of Horsey Sauce. It’s mild. Genuinely mild — there’s warmth in the finish but nothing that bites. That’s intentional. The product is designed to be a gateway condiment, not a horseradish experience. Many copycat recipes call for 3–4 tablespoons of horseradish per 1/2 cup mayo, which produces something twice as sharp as the restaurant version.
No sugar. In the official ingredient list, the sauce contains both high fructose corn syrup and corn syrup. Sweet is the dominant flavor alongside creamy. Recipes that skip sweetener end up flat and one-dimensional — sharp without the balancing richness.
Skipping the mustard. Mustard flour appears in the official ingredient list. It’s subtle — you won’t taste “mustard” in the sauce — but it adds a background savory sharpness that rounds the whole thing out. A quarter teaspoon of yellow mustard does the same job at home.
The Rest Time Matters
Fresh-mixed Horsey Sauce tastes fine but slightly separate — you can taste the mayo, the horseradish, and the vinegar as distinct notes. After 30 minutes in the refrigerator, those notes integrate into a single unified flavor. After 2 hours, it’s noticeably better. After 24 hours, it’s at its best.
If you’re making this for a specific meal, mix it the day before and pull it from the fridge 10 minutes before serving.
What to Serve It With
The most obvious pairing is Arby’s Beef and Cheddar — swap it in for the Red Ranch if you want something creamier and milder than the default tangy-smoky sauce. It’s also the best dipping sauce for Arby’s Curly Fries — the sweetness and mild horseradish pair well with the paprika-cumin spice blend on the fries.
Beyond Arby’s copycats, it works anywhere you’d use a mild aioli: roast beef sandwiches, cold sliced prime rib, grilled chicken wraps, or alongside any smoked meat where you want a cool, creamy counterpoint without overpowering heat.
Notes on Ingredients
Creamed vs. prepared horseradish: Creamed horseradish (horseradish blended with cream or sour cream) is the better choice here because it’s already mild and uniform — closer to the horseradish powder used in the restaurant version. If you’re using plain prepared horseradish in vinegar, start with 1 tablespoon instead of 2 and taste. Brands vary significantly in heat level; “Extra Hot” varieties can easily double the punch of a standard jar.
Mayo brand: Best Foods (sold as Hellmann’s east of the Rockies) is strongly recommended. Its clean, neutral richness is the closest match to the oil-emulsion base of the original. Avoid Miracle Whip — it adds competing sweetness and tang that fights the other flavors.
Vinegar: Distilled white vinegar. Not cider vinegar (too fruity), not white wine vinegar (too subtle). The original uses distilled vinegar and the flavor is specific.
Sugar: Granulated white sugar dissolves quickly in the mayo. Honey works as a substitute but adds a slight floral note that isn’t in the original.
