Soak skewers in water for 60 minutes or make Recipe #227473 .
Combine margarita mix, tequila, coriander, and garlic. Place pork cubes in heavy zip lock bag; pour marinade over to cover. Marinate for at least 30 minutes.
Blend together well the butter, lime juice and zest, sugar and parsley; set aside. Thread pork cubes onto skewers, alternating with pieces of corn and pepper. Grill over hot coals, basting with butter mixture, for 15-20 minutes,turning frequently.