Spring Herb Pesto with Roasted Walnuts

When someone mentions “pesto,” you probably think about basil. It’s become synonymous with a traditional pesto alla genovese, a beautiful basil sauce originating from Genoa used on pizzas, pastas, in soups, and as part of many delectable appetizers. But “pesto” is actually the shortened form of the word “pestato,” meaning to pound or crush, referring…