Bread (chleb) is a central part of Polish food culture. Polish bread is traditionally made with sourdough, although other leavening agents are also used today. The most common types of bread are Mieszane pieczywo (wheat mixed bread), chleb biały (white bread), chleb graham (Graham bread), and chleb razowy (whole wheat bread). Other common baked goods in Poland are bułka (rolls) and rogal or rogalik (croissants), which can be considerably larger than their German counterparts, while loaves of bread are usually smaller in comparison. Drożdżówka (sweet rolls made from yeast dough or Danish pastry, often filled with white cheese, poppy seeds, blueberries, plums, rhubarb, or fruit jam) are also widely available.