Ukrainian Ravioli with Potato and Onion

This recipe was one which came to us via three Ukrainian students who came to stay with us. Their recipes were always cheap, filling, but nevertheless delicious. The first time I took them to a supermarket one of them took to his bed with a severe headache, he was so overcome by all the food which could be purchased. We always had a joke when cooking with them: was the recipe prerevolution or post-revolution? If they replied post-revolution, we always reminded them we could get all the ingr