This sauce is great with various kinds of seafood, like crab cakes, fish sandwiches and fried seafood like oysters. This recipe comes from AllRecipes.com® and it is quite close to what I have made for many years. It will be very good. You can vary the amount of lemon juice to suit yourself.
1 cup of mayonnaise
1 tablespoon (or more) of sweet pickle relish
1 tablespoon of minced onion
2 tablespoons of lemon juice (amount optional)
salt and pepper to taste
Simply mix the ingredients together and then cover the container and refrigerate the sauce for at least one hour before use.