This iconic Indianapolis sauce delivers the perfect balance of creamy richness and bold horseradish heat. A timeless companion to steaks and sandwiches alike.
The secret lies in the careful ratio of prepared horseradish to mayonnaise, creating a classic condiment that’s both fiery and smooth.
Ingredients for St Elmo’s Horseradish Sauce
Nine ingredients create this bold, creamy Indianapolis classic condiment with signature heat.
| Ingredient | Amount | Notes |
|---|---|---|
| Prepared Horseradish 🌿 | ½ cup | Freshly opened for maximum heat |
| Mayonnaise 🥚 | 1 ½ cups | Full-fat for creamy texture |
| Sour Cream 🥛 | ½ cup | Full-fat for richness |
| White Vinegar 💧 | 1 tbsp | Balances heat with acidity |
| Worcestershire Sauce 🍶 | 1 tsp | Vegetarian variety recommended |
| Granulated Sugar 🍚 | ½ tsp | Dissolves evenly in sauce |
| Dijon Mustard 🟡 | 1 tsp | Adds depth and tang |
| Salt 🧂 | ¼ tsp | Fine grain for even distribution |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground preferred |
The horseradish is non-negotiable here—Bubbies or Silver Spring brands deliver the authentic heat level. Look for prepared horseradish in the refrigerated section (the shelf-stable kind lacks punch). Mayonnaise quality matters: Duke’s or Hellmann’s provide the right creamy base. Sour cream adds tang; full-fat Daisy or Organic Valley are reliable choices. Avoid low-fat versions—they’ll make the sauce watery.
No prepared horseradish? Freshly grated at one-third the amount (but wear gloves—it’s potent). Vegan? Swap mayo and sour cream for vegan alternatives like Just Mayo or Kite Hill. Worcestershire must be vegetarian—Annie’s or Edward & Sons skip the anchovies. Sugar can be reduced, but it tempers the heat. Dijon can be replaced with yellow mustard, though the flavor profile shifts slightly.
This sauce holds well. Refrigerate in an airtight container for up to 2 weeks. The flavor actually improves after 24 hours as the horseradish melds. Stir before using—separation is natural. Freezing isn’t recommended; it breaks the emulsion.
Why You’ll Love This Recipe
- 5-Minute Mix: I just stir together the prepared horseradish, mayo, sour cream, and a splash each of vinegar and Worcestershire—no cooking, no fuss.
- Punch You Love: The horseradish hits hard, then mellows into creamy richness from the mayo and sour cream, with that tangy Worcestershire kick at the end.
- Steakhouse at Home: I dollop it on prime rib, spread it on roast beef sandwiches, or even use it as a dip for fries—it’s my secret weapon for restaurant-quality meals.
- Keeps for Days: Honestly, it tastes even better the next day, and a small batch lasts me a week in the fridge for whenever a craving strikes.
Step-by-Step Instructions for St Elmo Horseradish Sauce
This method delivers the signature balance of fiery heat and creamy richness the dish is known for.
Step 1: Combine the Creamy Base
In a medium mixing bowl, whisk together the 1.5 cups Mayonnaise and 0.5 cup Sour Cream until completely smooth. I use a silicone spatula for this, scraping the sides and bottom of the bowl to ensure even incorporation.
The full-fat versions are essential here—they create the velvety texture that makes this sauce so distinctive. You’ll notice the mixture becomes slightly paler as the sour cream fully integrates with the mayonnaise.
Step 2: Incorporate the Acidic Elements
Add the 1 tbsp White Vinegar, 1 tsp Worcestershire Sauce, and 0.5 tsp Granulated Sugar to the bowl. Stir gently but thoroughly to distribute these liquid ingredients evenly throughout the creamy base.
The vinegar’s sharpness will cut through the richness, while the Worcestershire adds its characteristic depth. The sugar may seem minor, but it balances the acidity perfectly without making the sauce sweet.
Step 3: Introduce the Spice and Seasoning
Stir in the 0.5 cup Prepared Horseradish, ensuring it’s fully incorporated. For maximum heat, use freshly opened prepared horseradish as specified. The sauce will immediately take on a pale greenish tint from the horseradish.
Next, add the 1 tsp Dijon Mustard, 0.25 tsp Salt, and 0.25 tsp Black Pepper. The Dijon adds another layer of tang that complements the horseradish beautifully, while the salt and pepper enhance all the other flavors.
Step 4: Rest and Develop Flavors
Cover the bowl with plastic wrap and refrigerate for at least 2 hours. This resting period is crucial—it allows the flavors to meld and the heat from the horseradish to fully infuse the sauce.
You’ll notice the sauce thickens slightly as it chills. The horseradish’s pungency will mellow just enough to create that perfect balance of heat and creaminess that defines this classic sauce. Stir before serving to redistribute any separated elements.
Pro Tips For Making St Elmo’S Horseradish Sauce
- Chill Before Serving: After mixing all the ingredients, let the sauce sit in the fridge for at least 30 minutes. I learned this the hard way—freshly mixed horseradish can taste harsh, but chilling mellows the heat just enough.
- Use Full-Fat Sour Cream: Skip the low-fat version; full-fat sour cream gives the sauce that creamy, rich texture St. Elmo’s is known for. Sounds weird, but it works—low-fat can make the sauce runny and less flavorful.
- Drain the Horseradish: If your prepared horseradish is watery, drain it in a fine-mesh strainer for a few minutes before mixing. My grandmother swore by this, and she was right: excess liquid makes the sauce thin and weak.
- Add Vinegar Last: Mix all the other ingredients first, then stir in the white vinegar at the end. I was skeptical until I tried it—adding vinegar too early can curdle the mayo and sour cream if you’re not careful.
Flavor Customization for This Recipe
Milder Heat Version
For those who prefer less fire, simply reduce the Prepared Horseradish to ¼ cup and add 1 tbsp sour cream to compensate. This creates a gentler sauce that still packs flavor without overwhelming spice. I often make this adjustment for family gatherings. 💡
Extra Tangy Twist
Boost the acidity by adding 1 additional tbsp White Vinegar or substituting it with apple cider vinegar for a fruitier note. The extra tang pairs beautifully with fried foods. Just balance it with an extra ¼ tsp Granulated Sugar to keep the heat in check.
Spicy Kick
For serious heat lovers, add 1 tsp cayenne pepper or ½ tsp hot sauce to the finished sauce. I recommend Frank’s RedHot for a vinegar-based kick that complements the existing flavors. Stir well and let it rest for 30 minutes before serving. 🔥
Herb Infusion
Add 1 tbsp finely chopped fresh dill or 1 tsp dried dill for a bright, herbaceous note. This works particularly well with seafood dishes. The dill’s grassy flavor cuts through the richness while adding a fresh dimension.
Smoky Depth
Incorporate ½ tsp smoked paprika or a dash of liquid smoke for a BBQ-inspired variation. This adds complexity that pairs wonderfully with grilled meats. Just a small amount transforms the sauce into something special.
Sweet and Creamy
For a sweeter profile, increase the Granulated Sugar to 1 tsp and add 1 tbsp honey. This creates a milder, slightly sweet sauce that’s perfect for dipping or sandwich spreads. The honey adds a floral note that balances the horseradish beautifully.
Nutrition Facts
Frequently Asked Questions
Can I use fresh horseradish root instead of prepared?
Yes, but use 1/3 cup freshly grated for every 1/2 cup prepared. Wear gloves and work near a fan—the fumes are intense!
Why does my sauce taste too sharp?
Let it rest for 24 hours in the fridge. The heat mellows as flavors meld. If still too strong, stir in 1-2 tbsp sour cream.
How long does it keep in the fridge?
Up to 2 weeks in an airtight container. Stir before using, as some separation is natural.
What’s the best way to adjust the heat level?
Start with 1/4 cup prepared horseradish, taste, then add more in 1 tbsp increments until perfect.
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