From Food Network website. I have changed this to be a vegetarian dish. You can substitute vegetarian kielbasa with the real thing, of course. I have made this a couple of times, and the taste changes depending on the type of pierogis used. You can use beet leaves rather than kale, if you'd like. This is a great way to use up some of those winter greens! I often leave out the kielbasa all together as there is only two of us here and it is just too large of a dish with it included. Vegetarian kielbasa is available under the Tofurkey and Boca brands at your local health food store (at least in California!)You can also order it online.