Marinate the pork with pineapple juice, chili powder, cumin, oregano, garlic, and vinegar for at least 2 hours.
Preheat the grill or skillet over medium heat.
Remove the pork from the marinade and let excess liquid drip off.
Grill the pork for about 5-7 minutes per side until cooked through.
Allow the pork to rest for 5 minutes before slicing it into smaller pieces.
Warm the corn tortillas on the grill for about 30 seconds on each side.
Assemble the tacos by placing a generous amount of pork on each tortilla.
Top with diced pineapple, chopped onion, and fresh cilantro.
Serve immediately with lime wedges on the side.
Enjoy your delicious Tacos al Pastor!