Paczki Day, also known as Fat Tuesday or Mardi Gras, is celebrated the day before Ash Wednesday in many cultures, particularly in Poland and among Polish communities. The day is marked by indulging in paczki, which are rich, filled doughnuts typically made with eggs, butter, and sugar. These treats are often filled with fruit preserves or cream and are enjoyed as a way to use up rich ingredients before the fasting season of Lent begins. In the United States, especially in cities with large Polish populations like Detroit and Chicago, Paczki Day has become a popular tradition. Bakeries often prepare large quantities of paczki, and people line up to buy them. The day is a festive occasion, celebrating the delicious pastries and the cultural heritage of the Polish community.