Heat BBQ grill to medium high.

Discard outer leaves of romaine head. Trim the stalk end slightly. You want to keep it intact so the lettuce leaves hold together on the grill. Cut the head in half vertically. Rinse well.

Lay prosciutto out in single layer on a microwaveable plate. Microwave on medium/high 2-3 minutes. Check and add time as needed until the slices are crispy and brittle. When cool break them into small bits.

Grill the romaine cut side down. Put the tomatoes on a grill pan so they heat at the same time as the lettuce. You should see grill marks and bit of charring on the cut side and edges of the romaine. This may take about 5 minutes.

Transfer lettuce and tomatoes from the grill to a serving platter. Cut each lettuce half vertically in 2 so you have 4 portions. Sprinkle with tomatoes, prosciutto and drizzle your favourite dressing over it.