It's grown in sheds and harvested by candelight
Of course its rhubarb!
The beeb has a good piece on this veg, to be honest I never liked it as a kid(and have not had it since) but some do!
Yorkshire's biggest growers are attempting to get Protected Designation of Origin (PDO) from the EU for the dozen producers across the region in whats called the Yorkshire Rhubarb Triangle.
Good luck to them, as protecting your traditional wossnames is very important
The current PROTECTED FOOD include Modena balsamic vinegar, Parma ham, Newcastle brown ale, Kalamata olives, Roquefort cheese and Arbroath smokies.