Dessert perogies may not be familiar to those without Northern European connections, but they are as big a part of a traditional meal as the more savory varieties. And on the Canadian Prairies, those desserts take the form of saskatoon berry perogies. Rob Engel, the owner of Baba’s Homestyle Perogies, notes that a traditional Ukrainian dessert perogy would have a prune filling. When Ukrainians first started immigrating to the Canadian Prairies more than 100 years ago, however, prune plums were nowhere to be seen, both on trees or in local…