Divide meat into 8 equal pieces. Shape intoballs. Press 1 cheese piece into center of 1meatball and enclose cheese in meat. Flattento 21/2- to 3-inch-diameter patty. Repeat toform 7 more patties.
Sprinkle both sides ofpatties with salt and pepper.
Prepare barbecue (medium-high to highheat). Grill patties until cooked to desireddoneness and cheese centers soften, about 5minutes per side for medium. If desired, grillcut side of rolls until toasted, about 1 minute.