Combine mayonnaise, 2 tablespoons relish, 1 tablespoon chopped onion, capers, parsley, and sugar in a blender until smooth. Transfer sauce to a bowl; stir in remaining 1 1/2 tablespoons relish and 1 tablespoon chopped onion. Cover with plastic wrap and refrigerate for at least 2 hours before serving.

Tartar sauce is traditionally served with seafood dishes like crab cakes and fish and chips, but in our house, we eat it with veggies instead! Here are a few of our favorite ways to enjoy it: With crispy baked (or air fried) veggies.

Wondering what's in tartar sauce? It's typically made with mayonnaise, chopped pickles or relish, lemon juice, and herbs (like tarragon and dill). There are also a handful of optional ingredients you can add that take the tartar sauce's flavor to the next level. For example, this recipe includes yellow mustard.