Grill, uncovered over medium-hot coals (350F to 400F / 175C to 205C) 8 to 9 minutes or until desired doneness, turning and basting frequently with reserved marinade.
Discard any remaining marinade.
for sauce In a small saucepan bring vinegar to a boil.
Stir in sugar and simmer 5 minutes.
Remove from heat and stir garlic paste and red pepper flakes into vinegar.