Wash each head of romaine lettuce and shake out as much water as possible. Use a sharp knife to slice each head of lettuce in half lengthwise, creating a flat surface for grilling. Leave the root end intact for easy grilling.

Drizzle the cut side of each half head of lettuce with olive oil or brush it with oil using a pastry brush. This just helps protect it from sticking to the grill and burning too quickly. Sprinkle with salt and pepper to season it.

Lay the lettuce sliced side down on the hot grill and let it smoke for about 5 minutes until the grill side is slightly charred.

Remove from the grill and drizzle with caesar salad dressing. Sprinkle with shaved or freshly grated parmesan and croutons.