Purple dead nettle is more than a weed. It's rich in vitamins, packed with antioxidants, and has anti-inflammatory properties. People use it in teas, soups, and pestos.

1/4 cup toasted walnuts. Salt, freshly ground pepper, to taste. 1/3 cup extra-virgin olive oil. For the pesto: Combine the first four ingredients in the bowl of a food processor and blend.