I've always loved Karjalan piirakat; one of these days I'll actually get round to seeing if I can make something recognisable with the travesty that passes for ruisjauho in the UK.
Axis of Aevil quotes Roman Schatz from his Suomesta, rakkaudella with a hint as to why what's basically rye flour, potato (or rice) and butter tastes so good: "Wrinkle the edges of each pie to make it look like an aging Carelian vagina"...