A Spicy Perspective

Spicy Mustard Seafood Sauce

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Spicy 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

Dipping Sauce for Seafood

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.

Not to mention that summertime is the best time to head out towards the beach for vacation. This crab mustard sauce recipe will be your saving grace when making fresh seafood from home (or your vacation rental!) 

Shrimp, crab and lemon wedges on a platter next to a bowl of yellow sauce.

Seafood Dipping Sauce

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

Spicy Mustard Sauce Recipe

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

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.

Seafood platter with a small bowl of dipping sauce in the middle.

How To Make Spicy Mustard Seafood Sauce

  1. Start by grating a shallot into fine pieces with a sharp grater.
  2. Add the mayonnaise, French’s Classic Yellow Mustard, worcestershire sauce, onion, and a scant amount of horseradish to a bowl.
  3. Stir until smooth. Then chill the Spicy Mustard Seafood Sauce until it’s time to serve it.

This will be your new go-to sauce to make with almost any dish (including meats and veggies) to spice up the flavor profile, turning the dish from bland to grand!

Shallot being grated into the mustard sauce.

The Best 5 Ingredients 

This amazing recipe only takes 5 ingredients for endless dipping possibilities:

Seafood dipping sauce ingredients in a bowl before being stirred.

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

Ingredients needed for mustard seafood sauce.

Ways To Use Spicy Mustard Seafood Dipping Sauce

Try serving this seafood dip with:

Seafood platter with a mustard seafood sauce in the middle.

Not a fan of seafood?

Serve our mustard dip with:

  • Pork chops
  • Steaks
  • Chicken thighs
  • Baked Ham
  • Roasted Vegetables
  • French Fries
  • As a chip dip
  • Or sandwich spread

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

Mustard sauce in a small bowl on a serving platter with crab.

Frequently Asked Questions

Is mustard sauce good for your health? 

The health benefits of mustard comes mainly from the mustard seeds that are ground into mustard. Mustard seeds provide power-packed omega-3 fatty acids and calcium. They are also known to be antibacterial, antifungal, and even offer anti-inflammatory properties. 

How do you keep this mustard dip?

This mustard should stay in the fridge when not being served. Some mustards are able to stay at room temperature, however the horseradish in this dish needs to be refrigerated. Place it in an airtight container or jar and refrigerate for up to 3 weeks.

Can I use a different style of mustard? 

Although you can use any mustard in this recipe, classic yellow mustard provides the best color, tang, and spice level that appeals to most people.

Hand dipping crab into a bowl of mustard sauce.

Other Seafood Dishes:

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

Spicy Mustard Seafood Sauce #GlutenFree #DairyFree #Ketogenic
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5 from 9 votes
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Spicy Mustard Seafood Sauce Recipe

Prep Time: 5 minutes
Total Time: 5 minutes
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



  • Grate the shallots with a microplane or cheese grater.
  • Measure all the ingredients and place them in a small mixing bowl.
  • Stir well to combine. Then cover and chill until ready to serve.


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! 


Serving: 1.5tablespoons, Calories: 50kcal, Carbohydrates: 2g, Protein: 0g, Fat: 4g, Saturated Fat: 0g, Cholesterol: 2mg, Sodium: 239mg, Potassium: 25mg, Fiber: 0g, Sugar: 0g, Vitamin A: 15IU, Vitamin C: 0.2mg, Calcium: 5mg, Iron: 0.2mg
Course: Appetizer
Cuisine: American
Author: Sommer Collier

Making this recipe? Follow us on Instagram and tag @ASpicyPerspective so we can share what you’re cooking!

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

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14 comments on “Spicy Mustard Seafood Sauce”

  1. I used S&B oriental mustard powder instant of prepared mustard or horseradish. That S&B stuff is HOT, like Chinese restaurant hot, like wasabi hot!!!! Mixed with water to make a paste, added mayo, lemon juice, hot sauce, and black pepper. It was still super hot so mellowed it out with sweet relish and rose wine balsamic. That toned it down a lot. Served with steamed shrimp and oysters on the half shell. Everyone loved it but agreed a little goes a long way. We were thinking it might be really good putting that on good-quality hot dogs with some sauerkraut. Labor Day is coming up! Thanks for the inspiration!

    • I have enough left over I’m thinking of making a potato salad with it. Maybe add some seafood to it also. It also would be great to mix in for deviled eggs or as a sandwich spread. I’m feeling my Labor Day taking shape. Again, THANKS!

  2. This is absolutely the best mustard sauce I’ve ever made! You can put this on a car bumper and it’d be delicious! I use Dijon instead of yellow mustard cuz I like the heat but the shallot is what makes this IMO.

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  4. That spicy mustard is so good on seafood! It gives it a nice flavor!

  5. I made this sauce with our shrimp last night and it was incredible! Definitely our new go to condiment!

  6. I’ve been doing this sauce for years, but I add fresh garlic and little honey ?

  7. these are some great meals for the beach

  8. Thank you for such a great recipe. My husband’s family tradition is fondu on Christmas Eve. We have wanted a non sweet mustard sauce for dipping. This was it! Balanced and wonderful. It will be used in our family on Christmas Eve every year!

    Thanks again. It takes courage to publish a recipe. I appreciate your courage. 

  9. It is wonderful to be here with everyone, I have a lot of knowledge from what you share, to say thank you, the information and knowledge here helps me a lot

  10. 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.

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