Brown Butter and Herbs A simple topping for pierogies is to create a brown butter sauce with whatever herbs you have on hand. This is a great way to serve pierogies since it will pair well with whatever else you prepare alongside them, but it is still tasty on its own. Pierogi can be sweet, savory, or spicy, and the most common fillings include cheese, onions, ground meat, mushrooms, potatoes, and sauerkraut. The sweet versions commonly include various berries, such as strawberries or blueberries. Traditionally, these dumplings are served as the 12th course of a traditional Polish Christmas Eve dinner. During the autumn and winter months, pierogi are stuffed with a mixture of wild mushrooms and sauerkraut. These pierogi are traditionally eaten on Christmas Eve as many Polish people do not eat meat on this day for religious reasons. The dumplings are served in bowls of borscht. Summer is the season when most sweet pierogi are made. Ij4b.