My recipe for sour cream raisin pie is similar except we never used any water to plump raisins....we just added them dry to the custard base. Mom was a Mennonite and taught her 5 girls many economical recipes. Such as her homemade cottage cheese pie which was a basic custard pie with cottage cheese she made herself. . Today I would puree the cottage cheese making it more like a cheesecake in a pie shell.