Al pastor is the result of some beautiful cultural collision; Lebanese immigrants came to Mexico and shared their roasting-meat-on-a-spit ways. The Mexicans brought in their seasonings and the pineapple, and the deliciousness of al pastor was born. We've hewed pretty close to tradition here, filling our tacos with pineapple, lime-marinated shallot, and a spicy chipotle seasoning in the pork. The melding of new and old, tradition and innovation… culinary magic at its finest. Tip: Get your best zest: use the small holes of the grater, and press into it until the colored skin comes off. Zest as little of the white beneath as possible; the white is called pith and is quite bitter.