Butterbrod Day is observed in Germany every last Friday of September. This food holiday celebrates the traditional butterbrod, a single slice of bread topped with one ingredient such as jam, honey, or cold meats. The term "butterbrod" comes from the German words for butter and bread. Although butterbrods were once popular, their consumption has declined over the years, leading to the establishment of Butterbrod Day in 1999 by the Marketing Organization of German Agricultural Industries to revive interest in this dish. Unlike sandwiches, butterbrods are typically made with thicker, sourdough bread and are not topped with multiple ingredients or garnishes like lettuce or onions. The holiday aims to promote this unique German culinary tradition.