Spicy Mustard Seafood Sauce

5-Ingredient Spicy Mustard Seafood Sauce Recipe #GlutenFree #DairyFree #KetogenicSpicy Mustard Seafood Sauce Recipe – A 5-ingredients dipping sauce for crab legs and shrimp. Plus, it’s gluten free, dairy free, and ketogenic!

Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic
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Do you eat more seafood in the summer than any other time of year? We do.

Many types of fish and shellfish are so plentiful in the summer months, it just seems right to strap on a plastic bib and pull out the shell crackers.

Only 5-Ingredient Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

We love to steam or grill seafood in the warm season, then serve it with melted butter or creamy sauces.

However, this year I’ve been experimenting with dairy-free seafood dipping options, because our daughter is currently dealing with several food intolerances.

I want her to feel excited about her meals, even though she can no longer consume all the foods the rest of us can eat. Therefore, I’m skipping the classic standbys loaded with dairy and gluten, and using cleaner ingredients with bold flavor.

Making Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Today’s 5-ingredient Spicy Mustard Seafood Sauce recipe is my absolute new favorite dipping sauce for fresh-caught Dungeness crab and local Carolina shrimp.

It’s light and perky with a mellow base of gluten free mayonnaise, a strong tangy note from French’s® Classic Yellow Mustard, and a pop of spicy heat from onions and horseradish.

It’s got a kick, yet does not overpower the fresh sweet flavor of the seafood. Perfection!

French's Classic Yellow Mustard

French’s Classic Yellow Mustard is a summertime staple because it is packed with zesty appeal, and provides a gorgeous sunshine yellow color to recipes.

Yet, did you know it’s also very easy to incorporate into allergy-friendly foods?

Made with only mustard seeds, vinegar, water, and spices, French’s Classic Yellow Mustard is naturally gluten free, dairy free, soy free, nut free, and free of artificial colors and preservatives. Plus, it’s low carb keto fans!

It makes this Spicy Mustard Seafood Sauce a lean, yet tantalizing, addition to all your protein-packed seafood dishes.

Best Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

How To Make Spicy Mustard Seafood Sauce

Start by grating a shallot into fine pieces with a sharp grater.

How To: Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Add the mayonnaise, French’s Classic Yellow Mustard, worcestershire sauce, onion, and a scant amount of horseradish to a bowl.

How To Make Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Stir until smooth. Then chill the Spicy Mustard Seafood Sauce until it’s time to serve it.

Make: Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Ways To Use Spicy Mustard Seafood Sauce

Try serving this seafood dip with:

  • Shrimp
  • Crab claws and legs
  • Lobster tails
  • Grilled oysters or clams
  • Halibut, seabass, or grouper
  • Brushed over salmon before grilling or baking

Perfect Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Not a fan of seafood?

Serve our mustard dip with:

  • Pork chops
  • Steaks
  • Chicken thighs
  • As a chip dip
  • Or sandwich spread

Seriously, this “boss sauce” makes everything taste better!

Perfect Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Check the Spicy Mustard Seafood Sauce recipe card below to learn more!

Easy Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic

Find more recipes with French’s Mustard on Instagram, Facebook, and Pinterest.

Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic
5 from 2 votes

Spicy Mustard Seafood Sauce

Prep Time
5 mins
Total Time
5 mins

Spicy Mustard Seafood Sauce Recipe - A 5-ingredient dipping sauce for crab claws and legs, lobster, and shrimp. Gluten-free, dairy free, and ketogenic! 

Servings: 8 people
Nutrition Facts
Spicy Mustard Seafood Sauce
Amount Per Serving (1.5 tablespoons)
Calories 50 Calories from Fat 36
% Daily Value*
Total Fat 4g 6%
Saturated Fat 0g 0%
Cholesterol 2mg 1%
Sodium 239mg 10%
Potassium 25mg 1%
Total Carbohydrates 2g 1%
Dietary Fiber 0g 0%
Sugars 0g
Protein 0g 0%
Vitamin A 0.3%
Vitamin C 0.3%
Calcium 0.5%
Iron 1.1%
* Percent Daily Values are based on a 2000 calorie diet.



  1. Grate the shallots with a microplane or cheese grater.

  2. Measure all the ingredients and place them in a small mixing bowl.

  3. Stir well to combine. Then cover and chill until ready to serve.

Recipe Notes

NOTES: Add extra horseradish for a spicier sauce. This dipping sauce is also wonderful on oysters and clams, grilled pork chops, or as a sandwich spread! 

Disclosure: This post is sponsored by French’s Classic Yellow Mustard. All opinions are my own.

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3 comments on “Spicy Mustard Seafood Sauce

  1. Saraposted July 25, 2018 at 10:46 pm Reply

    I made this last week for a party and it was a huge it! The mustard flavor really accented the seafood. I used the leftovers on ham sandwiches and that was great too.

    • Sommer Collierposted July 29, 2018 at 10:39 pm Reply

      Hi Sara,

      Thanks so much for reporting back. I’m so glad you liked it!! :)

  2. Mirandaposted July 16, 2018 at 4:54 pm Reply

    YUM!! This was really delicious – thank you for sharing with me! I ended up using more horseradish, like you suggested