Iceberg lettuce is a veggie growing in the garden in the Isle of Wonder. Graham takes a cold head of iceberg lettuce to the Isle of the Beast before it melts, and tosses it into a Boiling Pool to cool it off.
Behind the scenes
The item may also be referred to as the 'head of iceberg lettuce".
King's Questions refers to both the plant and the item as the "Frozen Iceberg Lettuce".