Aha! Perhaps it is peculiar to Bishop's on Bradbury Place. When leaving Lavery's or whatever other pub in the district we had been frequenting, we would always stop in Bishop's for a mushroom chip. It's basically chips with Campbell's condensed mushroom soup and some chopped up mushrooms poured over it. Mmmmmmmmmmm. They stopped doing them for a while, but it was then brought back by popular demand. Heavenly! But a bugger to get off your coat if you eat it while pished.