Czech dumplings are my favourite eastern European dumplings. And the goulash is great. I also really liked at this time of year all the carts selling freshly roasted chestnuts as street food. And the thin waffle-like things with hazelnut cream you can get on the grounds of Prague castle.

Of course, Czech's have thing about filled donuts. The only two-story donut shop I've ever been to is at the foot of Wenceslas Square (across from Bata Shoes).