Slice pork into thin slices, place in a large resealable plastic bag.
Cut the pineapple into wide spears. Dice 1 cup worth of pineapple and set the rest aside
Add chopped onion into blender with cubed pineapple. Add Orange juice, vinegar, chipotle, chile powder, garlic, salt & oregano. Puree until smooth.
Pour marinade over pork. Let it marinate at least 4 hours
Heat skillet or grill to high heat. Sear each slice of pork until cooked through At the same time, grill pineapple until lightly charred. Roughly chop the cooked pork and dice cooked pineapple
Serve meat up on warmed tortilla topped with chopped cilantro, diced grilled pineapple, sliced red onion, and lime wedge
