Place beer, vinegar, apple cider, and liquid smoke into a large tupperware or glass dish. Place pork inside the dish and let marinate for 12-24 hours in the refrigerator.

Remove the pork, but reserve the marinade.

For the rub: mix cumin, garlic powder, paprika, and black pepper into a small bowl.

Rub each piece of pork generously with the seasoning. Place back into the refrigerator, let sit for another 12-24 hours.

Prepare your grill: For charcoal grill, place the reserved marinade in a foil tin pan (like a pie dish). Place the pan and marinade on the bottom shelf of your grill and surround with charcoal. Heat up your grill, and place pork in the middle of the grill (just above the marinade). Grill for approximately 45 minutes, covered, rotating the pork every 10-15 minutes. For a propane grill: Heat up your grill, place marinade on the bottom rack, and pork on a top rack above the marinade.