Pat the fish dry with paper towels and place it in a shallow dish.
Combine the garlic, ginger, chili, sugar, soy sauce and vinegar.
Spoon over the fish and let marinate for 15 minutes.
Arrange the fillets on a foil-lined grill tray and cook under a
medium heat for about 5 minutes, or until the fish is cooked through.
Do not turn the fish over during the cooking.
Serve with plenty of steamed rice.
Note : Korean chili powder is available from Asian specialty stores or
may be replaced with 1 teaspoon each of cayenne pepper and sweet paprika
for each teaspoon of chili powder.