EASY Homemade Tartar Sauce Recipe 1 cup mayonnaise 1 tablespoon sweet pickle relish 1 tablespoon minced onion 2 tablespoons lemon juice salt and pepper to taste In a bowl, mix mayonnaise, sweet pickle relish, and minced onion. Stir in lemon juice. Season to taste with salt and pepper. Refrigerate for about 1 hour before serving.