Walnut SauceWalnut sauce is classically made as a topping for one of Puebla's most famous dishes, Chiles en Nogada. This elegant dish features stuffed poblano chiles coated with walnut sauce and sprinkled with pomegranate seeds. It is most often served in autumn during walnut harvest. The sauce is also appropriate to drizzle over fresh fruits. Mexican crema is widely available these days and I recommend it above sour cream for this sauce.