McDonald's Big Mac Sauce

1/2 cup mayonnaise
2 tablespoons French dressing
4 teaspoons sweet pickle relish
1 tablespoon finely minced white onion
1 teaspoon white vinegar
1 teaspoon sugar
1/8 teaspoon salt
Makes about 3/4 cup.
Combine all of the ingredients in a small bowl.
Stir well.
Place sauce in a covered container and refrigerate for several hours, or overnight, so that the flavors blend.
Stir the sauce a couple of times as it chills.