Biay Barszcz, also known as Polish White Borscht Soup, is a traditional Polish soup made with fermented rye flour and sour cream. This creamy and tangy soup is flavored with garlic, marjoram, and bay leaves, and it is typically served with hard-boiled eggs and sausages. The sourness of the soup is balanced by the richness of the sour cream, creating a unique and comforting flavor. This Polish classic is perfect for cold winter days or as a starter for a festive meal.