How to Make It
Light a grill. Arrange four 12-by-24-inch sheets of heavy-duty foil on a work surface. Mound the tomatoes in the center of each sheet, drizzle with the olive oil and season with salt and pepper. Fold up the foil to create tight packets.
Set the packets on the grill and cover. Grill over moderately high heat for about 18 minutes, until the tomatoes begin to soften and burst. Using scissors, carefully cut open the foil packets and serve.