Brush the vegetables lightly with oil, season with salt and pepper and grill over medium high heat. Allow the vegetables to color well, remove from the grill and cool for several minutes. remove any blackened skin from the peppers.
Meanwhile, slice the bread open lengthwise and brush the inside lightly with oil. Grill the inside of the bread quickly and remove.
Assemble the still warm sandwich by alternating layers of vegetables, cheese, basil and then sprinkle on any remaining oil and a few drops of vinegar. Sprinkle on any herbs desired, tightly wrap with sandwich paper and slice into 4-inch lengths.