These perogies arrive uncooked, frozen and vacuum sealed to preserve freshness. When you are ready to cook them, boil from frozen. Bring large pot of water to a rolling boil, lower heat to 8 or nine and add perogies no more than 1 dozen at a time. When they float to the top, give them one minute then scoop off with a slotted spoon. Transfer to frying pan with butter and sauteed onions. (Vegan butter is fine)