There are a lot of varieties of mixed fillings that are used when cooking vareniki. Vareniki are served as a second course and of course can be consumed with a wide variety of sauces such as ketchup, mayonnaise, double or single cream, just butter. In Poland or Ukraine, in Russia they eat with sour cream. Smetana (sour cream) is a natural dairy product, something between a double cream and yogurt. By consistency is closer to yogurt, sour cream is sold in London in all Polish or Lithuanian stores and varies by the percentage of fat. It often located on the refrigerated shelves next to yogurt. Unfortunately for some reason in England, sour cream is not produced. Also, cottage cheese is not produced , although it is a very useful product for children. Cottage cheese is used as a main stuffing and children are happy to eat sweet vareniki. With cottage cheese usually make stuffing wit an any berries and raisins. Vareniki can be steamed or fried.