Cut meat into medium-sized pieces. Cut onion into similar-sized slices. Grate garlic.
Place pork in a glass bowl. Add all ingredients and mix well, ensuring each piece is evenly coated. Let it sit overnight covered in plastic wrap.
Preheat grill to medium heat. Thread peices of pork on a your skewers, being mindful to leave enough space at the bottom for flipping. Optional: Alternate pieces of onion in between each pork piece. Place skewers on a grill.
Grill pork kabobs to your desired doneness (about 4 minutes on each side or until the internal temperature reaches 145°). Serve right away.