They ARE everywhere. What connection, if any, they have with Cornwall I couldn't say, but I like them too.
There is something called
pirogithey make here in Russia which are pretty similar, or a pork roll consisting of a baked pork centre with cheese and garlic in a pasty-shaped case which goes a treat with the local beer, although it is definitely a knife and fork job to eat one.
I still occasionally bump into people in odd corners of the world who remember me as "Cornish", a nickname of sorts from my early tunnelling days. Junior engineers got nothing in the way of PPE in those days, and I wore my round-brim MSA hard-hat and a pair of those nigh-on indestructible Dunlop wellies ( bought from Cornish Industrial Supplies in St Austell, who used to come round the CSM at the start of the academic year ) for a long while, along with a set of Cambridge Council dustmans' overalls, which was considered quite eccentric.
those who have met me will understand the joke that anyone should refer to me as "Cornish"....
''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.