Ingredients

3/4 pound penne

8 ounces trimmed spinach

1/2 cup walnuts

1/2 cup grated Parmesan

1/4 cup olive oil

1 small garlic clove

Ricotta

Preparation

Cook penne, reserving 1/2 cup pasta water. In a food processor, pulse spinach, walnuts, Parmesan, olive oil, and garlic. Toss pesto with penne and pasta water; season. Serve with ricotta.