Semla can be seen everywhere at this time of the year. It
is a cardamom bun filled with almond sugar paste and topped with whipped cream. It is related to Fettisdagen which means fat Tuesday in English. The reason for this name is probably becuase it is supposed to be your last opportunity to eat fat meals before lent-term before the Eastern. Fettisdagen where sweet Semla is the main part of this is not on fixed day hence it may occur between 3rd of February and 9th March.
This year it will be on the 5th of March!
Of course you can find Semla in every shop on Fettisdagen, but only on that day. I hope you will have an opportunity to try it. Even though I know better sweets, you have to keep traditions related with food 😀