Today in Poland is what we call a Doughnut Day. It sounds better than Fat Thursday ;)
This is the last Thursday in Christian calendar before the Lent, and it starts the last week of carnival that ends on Ash Wednesday. According to tradition, believers are allowed to eat to their hearts' content before they have to fast from temptations like parties, drinking, eating in moderation, basically keeping away from temptations that are the weakest point for a person.
For many, many years it's usual to eat pączki, which are similar to doughnuts, but pączki do not have a hole in the middle. They can be plain with only powdered sugar or ic