Grill, uncovered over medium-hot coals (350°F to 400°F / 175°C to 205°C) 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. Cool.