Here is an excellent source for making Varenyky ( Perogies, Pyrohy, Pedehey, or as they refer to them on this site, heaven on a plate....) You will find a secret recipe there . I can not tell you what the secret is because having read it and used it I feel obliged to keep the secret. However, you can go and see the secret yourself at this site. The recipe is there and so are good instructions on how to make this heaven on a plate. The result was delicious.