In reality, we cook these pirozhki with brusnika and it is less sour than wild cranberry and very easy to pick up, as it grows in many forests of the European part of or country, Ural and Siberia. Alternatively, we can buy brusnika in season at the markets and frozen in shops.
This berry also grows in Finland, Sweden, Norway, Estonia, Lithuania, Latvia and some other Eastern and Central European countries, as well as in Canada and Alaska (although we don't know how it looks like on another continent).
Its name is very confusing for the English-speaking world and it is translated with a dozen of words, such as lingonberry, partridgeberry, mountain cranberry, red whortleberry and cowberry. Moreover, in many countries, it is hard to find. Therefore we decided to offer you cook our delicious piroshki with cranberries instead, but if you have our brusnika available in your country, use it!