Prepare the Marinade
Toast the dried chiles in a saucepan over medium-high heat until fragrant and pliable, about 5 minutes. Add chicken stock and let them soak for 10 minutes until softened.
Heat oil in the same pan and sauté oregano, cumin, and achiote paste for about 30 seconds until aromatic.
Transfer the softened chiles and sautéed spices to a blender. Add chipotle, vinegar, salt, sugar, and garlic. Blend until you achieve a smooth, thick marinade. Set aside to cool.
Prepare the Pork
Slice the pork into thin, even strips. For easier slicing, freeze the meat for 15-20 minutes.
Pound each slice gently with a meat pounder to tenderize and flatten it to about ¼ inch thick.
Coat the meat evenly with the prepared marinade, ensuring every slice is well covered. Cover and refrigerate for at least 4 hours, or preferably overnight for deeper flavor infusion.
Layering and Cooking
Oven Method:
Preheat oven to 275°F (135°C).
Line a disposable aluminum loaf pan with a layer of bacon. Add marinated pork slices in layers, alternating with bacon until fully packed.
Bake uncovered for 4 hours until the meat is tender and has released its juices.
Remove from oven, let cool, and refrigerate for at least 2 hours.
Grill Method:
Preheat the grill to low heat (275°F).
Place the aluminum loaf pan on indirect heat and cook for 4 hours, ensuring consistent heat throughout.
Once done, allow it to cool slightly, cover with foil, and refrigerate.
Finishing Touches
Preheat the oven to 350°F (175°C). Roast pineapple on a baking sheet lined with foil, brushing it with pork drippings for added flavor. Roast for 25 minutes until golden brown.
While the pineapple roasts, heat a large skillet over medium-high heat. Add sliced pork and some reserved juices. Sear the pork until crispy and caramelized.
Chop the roasted pineapple into bite-sized chunks and serve alongside the crispy pork.
Assemble the Tacos
Warm the corn tortillas until soft and pliable. Fill each tortilla with crispy pork, top with roasted pineapple, diced onions, and fresh cilantro.
Serve with salsa verde and lime wedges on the side.