I too made Pierogi, I use the dough rrecipe an old family friend and my godmother made for decades. She used to make hundreds and freeze them to give to her kids. Too bad she is lost to this world with Alzheimers. It's a very tender and easy to work with dough.
Anyway I make a cheese filling, cottage cheese well drained - used to be farmer's cheese, but that is no longer available around here. I also make fried cabbage, I used to do some prune, but skipped it this year and tried mushroom. I have to have a few poppyseed - just for me, no one else likes them.
We've adapted the old Polish ways, used to do 12 meatless dishes when I was very little, but now we just make what we like. We start with a dried Mushroom soup, follow that with Herring and onions, pierogi, then sausage and sauerkraut and ham. We've added scalloped potatoes and a relish dish over the years, but for us it's not the holidays without what we consider traditional food.