Although Cochinita Pibil is from the Yucatan Peninsula, it is eaten and loved all throughout Mexico. Sophia's aunt Lupita guides us through this delicious recipe. The achiote paste is loosened up with vinegar and grapefruit juice, which stains the pork a beautiful deep red color and gives it an incredible flavor. We use the marinade for a nice pork shoulder, which we roast slowly for a few hours.