Rumptuous Javelin
The Rumptuous Javelin is a cabbage species grown mainly around the town of Scrote which in skilled hands can create specimens such as the 295 pound champion which won the local agricultural show, and prior to being converted into three large barrels of coleslaw was immortalised for posterity by artist Josiah Remnant in his masterwork Still Life with Cabbage, Broccoli both Green and Purple, Sprouts, Kale and Elderly Couple Being Attacked by Werewolf
Annotation
Note that there exists in Roundworld a variety of potato called a Pentland Javelin. Warning to fetishists of Rincewind's persuasion: googling for this may result in excess watering of the mouth.