Drtravels, from the Webster's online dictionary:

Main Entry: knish
Pronunciation: k&-'nish (You pronounce the "K.")
Function: noun
Etymology: Yiddish, from Polish knysz

A small round or square of dough stuffed with a filling (as potato) and baked or fried.

They may also be sold in the frozen food section of your local supermarket. They are very good!