I love pierogies and they finish this cabbage-kielbasa saute perfectly. I know there are plenty of really good cabbage, kielbasa and potato recipes, but the pierogies in this dish just melt in your mouth. Not a diet dish, but a delicious comfort food meal. I got the recipe from a PBS home cooking special and have loved it ever since. Note that cooking start times overlap in this recipe. Reduce the amount of butter if desired.