This one is good.

½ cup good quality mayonnaise
2 tablespoons ketchup or chili sauce
1 tablespoon fresh lemon juice or white vinegar
2 teaspoons granulated sugar
2 teaspoons finely minced sweet pickle (do not use relish)
1 teaspoon finely minced sweet onion
pinch of salt

Place all the ingredients in a small glass bowl and stir until well blended. Cover and refrigerate
for a few hours (stirring occasionally) to let the sugar dissolve completely and the flavors meld.

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