Prepare the al pastor marinade and marinate the chicken. Combine all the marinade ingredients in a blender and blend until smooth.
3 cloves garlic, 3 chipotle peppers, ½ cup orange juice, 1 tablespoon apple cider vinegar, 2 tablespoons brown sugar, 1 tablespoon achiote paste, 1 tablespoon ancho chili powder, 1 teaspoon ground cumin, 1 teaspoon dried oregano, 1 ½ teaspoons kosher salt
Place the chicken thighs and thinly sliced yellow onion in a large bowl. Pour the al pastor marinade over them and toss well to coat. Cover the bowl and marinate in the refrigerator for at least 5 hours or overnight (preferred).
½ yellow onion, 1 ½ pounds boneless
Preheat the oven to 425 degrees F, positioning the rack in the center. Line a large rimmed baking sheet with foil for easy cleanup if desired.
Bake. Transfer the marinated chicken and onions to the prepared baking sheet. Discard any leftover marinade. Add the diced pineapple to the baking sheet and toss everything together, ensuring the pineapple is coated with the marinade. Bake for 15 minutes until the chicken is almost cooked through. Remove the chicken from the oven to chop and preheat the broiler.
2 cups finely diced pineapple
Dice. Carefully chop the partially cooked chicken into bite-sized pieces on a cutting board. Return the chopped chicken to the baking sheet.
Broil. Place the baking sheet under the broiler and broil for 4-5 minutes (you may need less time for that depending on your oven, keep an eye on it!), turning the pan halfway through, until the al pastor chicken is browned and slightly crisp.
Serve! Serve the crispy chicken al pastor in tortillas for tacos or in a bowl with rice and beans for burrito bowls.
charred corn tortillas