PREHEAT oven to 450 degrees F or grill to medium-high.
CENTER half of the cauliflowerettes, broccoli and carrots on each sheet of Reynolds Wrap Aluminum Foil. Sprinkle with salt and pepper. Combine olive oil, garlic, oregano and balsamic; pour over vegetables on both sheets of foil. Top each with 2 ice cubes.
BRING up foil sides. Double fold top and ends to seal making one large packet, leaving room for heat circulation inside.
BAKE 20 minutes on a cookie sheet in oven OR GRILL 9 to 11 minutes in covered grill.