Pernil is pork marinated in a sauce of bitter orange juice, onion, garlic, achiote, cloves, cinnamon, cumin and panela and slow roasted in the oven for several hours.
I got this recipe from my SIL, Melinda.I'm kind of a wuss so I only use 1 tablespoon of the red pepper flakes but you can make these as HOT as you like.