Homemade Pittsburgh Pierogies with Sour Cream

"Whether you spell it pierogi, piroghi or pierogie, authentic homemade pierogies are a delicious treat and a Pittsburgh tradition. Here in Pittsburgh we eat more than 11 times the pierogies of any other city in the nation, according to a recent survey, with pierogi fillings ranging from standard potato and cheese to sweet prune. A popular Pittsburgh business, Pierogies Plus, ships pierogies as far away as Alaska and Hawaii. The Pittsburgh Pirates even hold a pierogi race during the bottom of the 5th inning at every Pirates home game. Sour cream in the dough is a favorite secret of many Pittsburgh pierogi makers...."