Wash berries; drain. In a medium bowl, sprinkle berries with sugar. Mix lightly. Fill pierogi shells and process immediately, before juice is drawn out of fruit. Makes about 4 cups or enough to fill 40 to 45 pierogies.Recipe by Marianna Olszewska Heberle. Published in HPBooks "POLISH COOKING" ISBN 0-89586-272-7. Jeanne in Jersey, J.ZIOLA on GEnie CBTN00C on P 09/21/92