What Mexican dish are you missing out on making? If you haven't mastered pipián yet, this recipe will provide you with all the ingredients needed for this Mexican sauce and step-by-step instructions to prepare it. Pipián's main ingredient is pumpkin seeds, which have been used since pre-Hispanic times in sauces with chiles to accompany fish and game meat. Today, pipián is one of the dishes with an extensive range of variants in Mexico and one with the most vibrant colors.