In this copycat In-N-Out Spread Recipe, common fridge and pantry ingredients are combined for a flavorful zippy spread for burgers and sandwiches or as a dip or topping for fries. This recipe yields approximately 3/4 cup or 6 (2-tablespoon) servings.
In a medium bowl, measure and add mayonnaise, ketchup, sweet relish, yellow mustard, white vinegar and a small pinch of kosher salt and some freshly ground black pepper, to taste.
Stir well to combine. Cover and refrigerate until ready to use.
