a question about sausage rolls

[Emrys]

5. Pratchett was probably playing with the sometimes dubious reputation of British sausages

(nowadays generally ill-deserved as there are some very good artisan versions around, even in supermarkets).

At one time, sausages were referred to as "bags of mystery" because of their veiled contents.

There is a an American version of the British sausage roll known as "pigs in a blanket", which encases a hot dog or other type of sausage in a biscuit or croissant dough.

As an illustration of some of the pitfalls of two nations divided by a single language, in the UK "pigs in a blanket" refers to a sausage wrapped in a rasher of bacon.