Dutch letter

The Dutch letter (originally from the Dutch Antilles which was a Dutch colony) (also referred to as banket letter, almond letter, butter letter, and in Dutch as banketstaaf, banketletter, boterletter, and letterbanket) is a type of pastry or cookie that is typically prepared using a mixture of flour, eggs and butter or puff pastry as its base and filled with almond paste (or persipan), dusted with sugar and shaped in an "S" or other letter shape. Marzipan, an almond paste prepared with almond meal and honey or sugar, is sometimes used as the filling. The Dutch letter has a porous or airy and flaky texture. 
The pastry was originally shaped "into the initial of the family's surname." Nowadays, the most common shape of the food in the United States is as the letter "S". Dutch letters are served as a treat during December, and particularly on "Sinterklaasavond" on December 5 in the Netherlands, and during some festivals in the United States.
Etymology.
The pastry's name is a shortened version of the Dutch word "banketletter". They may also be called "banketstaven", "boterletters", and "letterbanket" by Dutch people.
History.
Netherlands.
In the Netherlands "letterbanket" are traditionally eaten on "Sinterklaasavond" on December 5, where they are shaped in the initials of family members.
United States.
Iowa.
Dutch letters were introduced to the United States by Dutch immigrants, and originated in Pella, Iowa, which was founded in 1845 by "Dutch religious refugees." Dutch letters are a common treat at the annual Tulip Festival in Pella, Iowa, and may be prepared by local residents and sold at markets, gas stations, and various local churches.
Michigan.
Dutch letters prepared with chocolate are traditionally eaten as part of the activities during the Holland Dutch Winterfest in Holland, Michigan.