F. Davies Sauces A dipping sauce with buttermilk and pesto, 5 in. 1/2 qt. olive oil mayonaise 3/4 cup pesto sauce. 1 cup buttermilk Seasoning such as Uncle Dan's ranch dressing packet. Mix all together in a quart jar and refrigerate. Use as a dipping sauce for crackers etc. 1 quart My first attempt at including pesto in a recipe.