The Glamorgan Sausage, or Selsig Morgannwg, is a traditional vegetarian Welsh sausage which contains two very Welsh ingredients; Caerphilly cheese and leeks. It seems that they used to be made using Glamorgan cheese, but such a thing is no longer available, though it is reportedly very much like the creamy Caerphilly. If Caerphilly cheese is not available where you live fear not, mature cheddar cheese or something a little creamier will do just fine. Besides, it’s the breadcrumbs that really hold these incredibly tasty sausages together.