Pipián sauce, or pipián verde, is a sauce from the molé family that is traditionally served over roast chicken or enchiladas. It gets its distinctive green color from the tomatillos, jalapeños, and of course the pepitas, which distinguish pipián from other sauces. Although you can substitute de-hulled American pumpkin seeds for the pepitas, we’d advise using seeds specifically labeled as pepitas for the best results.