Dr. Weil

Put the walnuts in a food processor and grind them fine.Add the cilantro, jalapeño pepper, salt, vinegar, and 2-3 tablespoons of water and blend. Blend in a little more water if necessary to make a thick sauce.Taste and correct the seasoning, adding more salt if necessary.Keep any leftover pesto in the refrigerator in a tightly covered container and use as a dip or spread.