Zesty Pesto Sauce

Most pesto recipes are filled with olive oil and nuts, but this recipe from my daughter-in-law, Mika McDougall, MD, leaves out all of the oil and only uses a few walnuts. This is delicious and so easy to make, and is an excellent topping for pasta, pizza, salad, or whatever you choose. It is a richer food because of the walnuts, but is used as a topping so the amount of fat per serving is acceptable for most people.