Preheat the grill. Divide all the vegetables except the tomatoes on two roasting tins, season with salt pepper and place under a hot grill, turning once until just tender and golden brown.
Toss grilled vegetables with tomatoes, cheese, basil and vinegar in a bowl.
Grill the frozen garlic bread slices on both sides until golden brown, mound the vegetable onto each garlic bread slice and flash under the grill for a few minutes to reheat, serve immediately