Cinnamon Buns, or Korvapuustit in Finnish, are buns filled with cinnamon, sugar and butter. Cinnamon Buns are served oven warm with a glass of ice cold milk. Cinnamon Buns are sure to reward your taste buds! Finnish love their Cinnamon Buns and these buns even have their own annual National Day, which is celebrated every 4th of October.