Blooming Onion Dipping Sauce is the perfect creamy and tangy accompaniment for your deep-fried or air fried dish! Mayonnaise, ketchup, horseradish, and a few simple spices are whisked together in less than 5 minutes. Prep this Outback Steakhouse copycat recipe ahead of time and have it ready to enjoy when you are!

A metal spoon is used to serve the blooming onion sauce from a bowl.

Every good deep-fried or air-fried appetizer needs a creamy sauce to dip into… and this Blooming Onion Dipping Sauce is the perfect match! (And tastes JUST like the kind served at Outback Steakhouse!)

Just a few simple pantry staples are whisked together in a matter of minutes to create this savory, tangy, and somewhat spicy dip.

Not a huge fan of horseradish? No problem! Feel free to scale it back and add as much or as little as you’d like.

Since the dip will last for up to a month in the refrigerator, you can whip it up and have it on hand for all your dipping needs!

Dunk those golden brown onion petals from your homemade Air Fryer Blooming Onion, Air Fryer French Fries, or even Air Fryer Onion Rings.

Ketchup, mayo, horseradish, paprika, salt, garlic powder, oregano, and cayenne are the ingredients for this recipe.

Ingredients

The simple ingredients you need to make this copycat Outback Bloomin Onion Sauce recipe include:

  • Mayonnaise. Duke’s and Hellman’s are the best. You can also use a plant-based mayo.
  • Ketchup. Use your favorite ketchup or whichever one you have available. Both regular or no sugar added will work great.
  • Horseradish. Add this to taste for a nice kick.
  • Spices. A mix of garlic powder, paprika, and salt give the best flavor.

How to Make Blooming Onion Sauce

The basic steps for making Blooming Onion Sauce are simple to follow. Please see the recipe card below for more detailed ingredient amounts.

Whisk Together

Measure all of the ingredients into a medium-sized bowl. Stir them together using a whisk. Scrape the sides of the bowl with a spatula while mixing to ensure everything is well incorporated.

Refrigerate

The flavors in this sauce get better with time. After combining the ingredients, store it in the refrigerator for at least 24 hours before serving for the best taste.

Pair with an Air Fryer Blooming Onion, Air Fryer Onion Rings, Air Fryer French Fries, or tater tots!

Easy homemade blooming onion sauce is shown in a metal cup.

Meal Prep and Storage

  • To Prep-Ahead: Completely make the dip at least 24 hours in advance.
  • To Store: Seal in an airtight container and keep in the fridge for up to 1 month.
  • To Freeze: This is not recommended as the mayonnaise will separate.

Dietary Modifications

The recipe you’ll find below is already gluten-free, dairy-free, and vegetarian as written. Here are some adjustments and substitutions you can make to help it fit your other dietary requirements:

  • Vegan – Use a plant-based mayonnaise.
  • Low-Carb and Keto – Choose a no sugar added ketchup.

FAQs

What is Blooming Onion Sauce made of?

The dipping sauce has a mayo base that is flavored with ketchup, horseradish, and seasonings.

Why is the Bloomin Onion so bad for you?

Because the Blooming Onion at Outback is coated in a batter then deep-fried, it is high in calories and fat.

How can you make Blooming Onion sauce less spicy?

For a milder sauce, either reduce the amount of horseradish used or leave it out completely.

A blooming onion petal is dipped into the sauce.

Expert Tips and Tricks

  • Stir and scrape. Use a combination of a whisk and a spatula to ensure everything is thoroughly incorporated.
  • Rest. For the best flavors make the sauce at least 24 hours in advance.
  • Taste. Adjust the amount of horseradish to fit your preferences.
  • Go plant-based. It’s easy to swap out the mayonnaise for a plant-based version.

More Dipping Sauce Recipes

Pair your favorite finger foods with any of these tasty condiments:

Homemade Tartar Sauce

Remoulade Sauce

Chick-fil-a Sauce

Spicy Sriracha Mayo

Secret Sauce

Avocado Ranch

Cocktail Sauce

Tap stars to rate!

4.67 from 3 votes

Blooming Onion Sauce Recipe

Blooming Onion Dipping Sauce is the perfect creamy and tangy accompaniment for your deep-fried or air fried dish! Prep this Outback Steakhouse copycat recipe ahead of time and have it ready to enjoy when you are.
Yield 8 servings
Prep 5 minutes
Total 5 minutes

Ingredients 

  • ½ cup mayonnaise or a plant-based alternative
  • 1 Tbsp. ketchup regular or no sugar added
  • 2-3 tsp. horseradish to taste
  • ½ tsp. paprika
  • ¼ tsp. garlic powder
  • ¼ tsp. oregano dried
  • Pinch of cayenne pepper optional
  • ¼ tsp. salt to taste

Instructions 

  • Combine all ingredients in a medium-sized bowl and whisk to combine. Add a teaspoon of horseradish at a time, depending on your desired taste.
    ½ cup mayonnaise, 1 Tbsp. ketchup, 2-3 tsp. horseradish, ½ tsp. paprika, ¼ tsp. garlic powder, ¼ tsp. oregano, Pinch of cayenne pepper, ¼ tsp. salt
  • Serve immediately with an Air Fryer Blooming Onion or store in the refrigerator for up to 24 hours for the best flavor. Enjoy!

Tap stars to rate!

4.67 from 3 votes

Notes

  • One serving is roughly 1 tablespoon of sauce.
  • To Store: Seal in an airtight container and keep in the fridge for up to 1 month.
  • To Freeze: This is not recommended as the mayonnaise will separate.

Nutrition

Calories: 100kcal, Carbohydrates: 1g, Protein: 1g, Fat: 11g, Saturated Fat: 2g, Polyunsaturated Fat: 6g, Monounsaturated Fat: 2g, Trans Fat: 1g, Cholesterol: 6mg, Sodium: 171mg, Potassium: 22mg, Fiber: 1g, Sugar: 1g, Vitamin A: 173IU, Vitamin C: 1mg, Calcium: 5mg, Iron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

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