Captain D's Copycat Tartar Sauce Recipe: Creamy Dill-Pickled Onion Magic

This Captain D's copycat tartar sauce brings that signature creamy, tangy flavor straight to your kitchen counter with just five simple ingredients. The secret lies in balancing fresh dill, finely chopped pickles, and a hint of lemon juice to mimic the restaurant version perfectly.

I developed this recipe after years of testing—every batch delivers that signature texture and zing.

What makes this sauce truly special is its foolproof method: blending mayonnaise with finely chopped cornichons and capers creates that signature grainy texture, while fresh dill and lemon brighten the flavor.

The result is a sauce that's creamy yet slightly textured, with a tangy kick that pairs perfectly with fish, fries, or even as a dip. No special equipment needed—just a bowl and a fork.

You'll end up with a batch of tartar sauce that's restaurant-quality yet takes less than 10 minutes to prepare. The flavors meld beautifully when chilled, making it ideal for meal prep or serving immediately.

Whether you're hosting a seafood dinner or craving that familiar Captain D's taste, this sauce delivers every time.

Store it in an airtight container in the refrigerator for up to 5 days, or freeze for longer shelf life. The sauce only gets better as the flavors develop, so make a double batch—you'll want to use it again and again. Let's get started!

Ingredients for captain d's copycat tartar sauce

Five ingredients, one bowl, restaurant-quality tartar sauce in minutes.

The mayo is non-negotiable here—Duke's or Hellmann's are my go-tos, but any full-fat brand works. Cornichons are the secret weapon; Trader Joe's or French specialty stores carry the best. If you can't find them, tiny dill pickles chopped super fine will do in a pinch. The dill should be bright green and fresh—no wilted stems. I always buy extra and freeze half for smoothies. Capers? Look for the non-pasteurized kind if you can—they pack more flavor, but pasteurized is fine too.

No cornichons? Extra dill pickles plus a pinch of sugar mimics the tang. Short on capers? More pickled onions or a dash of Worcestershire sauce adds depth. The lemon juice is crucial—bottled won't cut it. Need to make it ahead? Mix everything except the pickled onions first, then fold those in right before serving. That keeps the texture perfect. For extra tang, add a tiny splash of hot sauce or a pinch of Old Bay seasoning. Trust me, it works.

This sauce keeps for 5 days in the fridge—it only gets better as the flavors meld. For longer storage, freeze in ice cube trays and transfer to a bag. Thaw overnight in the fridge. Double the batch if you're serving a crowd; it disappears fast with fries or fish. Always taste before serving—adjust salt or lemon as needed. The magic is in the balance.

Step-by-step instructions for Captain D's copycat tartar sauce

This is the real deal—creamy, briny, and packed with that signature dill-pickled onion flavor you love.

Start by finely chopping the 0.25 cup cornichons and 2 tablespoons pickled onions using a sharp chef's knife. You want tiny, even pieces—think more of a fine dice than a rough chop. This ensures a smooth, creamy texture without any noticeable chunks. I like to work in stages here: chop half the cornichons, then mix them in, then chop the rest. This keeps the prep manageable and prevents a messy counter.

Rinse the 2 tablespoons capers if they're packed in saltwater, then drain them well. Pat them dry with a paper towel to remove any excess moisture—this prevents your sauce from becoming watery. The capers should be finely chopped as well, though their small size means they won't need as much attention as the cornichons.

In a medium bowl, combine the 1 cup mayonnaise, 0.25 cup finely chopped fresh dill, 1 tablespoon freshly squeezed lemon juice, and the drained capers. Use a silicone spatula to gently fold everything together until fully incorporated. You're looking for a smooth, homogeneous mixture—no streaks of mayonnaise or clumps of dill. This step is all about creating a creamy base that will hold up to the bold flavors you're about to add.

Now, add the 0.25 teaspoon salt and 0.125 teaspoon black pepper to the bowl. Give it one more stir to distribute the seasoning evenly. Taste the mixture at this stage—it should be tangy from the lemon, slightly briny from the capers, and fresh from the dill. If it needs more brightness, add a tiny splash of lemon juice; if it needs more salt, adjust now while you can still taste the individual components.

Gently fold in the finely chopped cornichons and pickled onions using the spatula. Work in small batches to avoid overmixing, which can break down the mayonnaise and make the sauce grainy. You want the texture to remain smooth and velvety, with just a hint of crunch from the pickles. If the mixture looks too thick, add 1 teaspoon of water at a time until it reaches a spreadable consistency—it should coat the back of a spoon but still hold its shape.

Taste again and make any final adjustments. The sauce should be creamy, slightly tangy, and bright with dill flavor. The cornichons and pickled onions should add a sharp, briny contrast that balances the richness of the mayonnaise. If the flavor isn't quite right, don't be afraid to tweak it—this is your copycat version, after all.

Cover the bowl with plastic wrap and refrigerate the sauce for at least 30 minutes before serving. This chilling step allows the flavors to meld together, making the sauce even more cohesive and delicious. The cold temperature also helps the mayonnaise firm up slightly, giving it a more stable texture that's perfect for dipping or topping.

When you're ready to serve, give the sauce one last stir to ensure everything is evenly distributed. The sauce should be thick, creamy, and ready to pair with crispy fish, golden fries, or fresh seafood. If it thickens too much after chilling, stir in 1 teaspoon of water or a splash of lemon juice to loosen it up. Enjoy immediately for the best texture and flavor!

Pro cooking tips for great captain d's copycat tartar sauce

Mayonnaise Quality Matters

Never skimp on the mayo—this is where the sauce’s creamy texture comes from. I always use Duke’s or Hellmann’s full-fat mayonnaise because they’re stable and rich. If you’re using a store brand, check the fat content; anything less than 70% oil by weight will make your sauce break down faster.

For a lighter version, try Primal Kitchen avocado oil mayo, but expect slightly less stability. 🥫

Chop Cornichons Like a Pro

The key to that signature grainy texture is finely chopping the cornichons—think almost paste-like, not chunky. Use a sharp chef’s knife and work in stages: chop half, mix it in, then chop the rest.

This prevents a messy counter and ensures even distribution. If you don’t have cornichons, tiny dill pickles chopped super fine work in a pinch, but they won’t be as tangy.

Balance Flavors Precisely

Taste as you go! After mixing the mayo, dill, lemon, and capers, adjust the lemon juice for brightness or salt for depth.

The cornichons and pickled onions should add briny contrast, but if the sauce tastes flat, add ½ teaspoon more lemon juice or a pinch of Old Bay seasoning. I’ve found that a tiny splash of hot sauce (like Cholula) can elevate the flavor without overpowering it.

Prevent Watery Sauce

Drain and pat dry the capers thoroughly to avoid a watery sauce. If the mixture looks too thick after adding the cornichons, thin it with 1 teaspoon water at a time.

For extra insurance, chill the sauce for 30 minutes before serving—this firms up the mayo and lets flavors meld. If it thickens too much later, stir in a splash of lemon juice or water to loosen it.

Make-Ahead Magic

This sauce tastes even better after chilling! Mix everything except the pickled onions first, then fold them in right before serving to keep their crunch. Store in an airtight container for up to 5 days in the fridge.

For longer storage, freeze in ice cube trays—thaw overnight in the fridge. Double the batch; it disappears fast with fries or fish! 💫

Frequently asked questions