Sweetened potato casserole (Finnish

Finnish language

Finnish is the language spoken by the majority of the population in Finland Primarily for use by restaurant menus and by ethnic Finns outside Finland. It is one of the two official languages of Finland and an official minority language in Sweden. In Sweden, both standard Finnish and Meänkieli, a...

 imelletty perunalaatikko) is a traditional Finnish dish from Kymenlaakso

Kymenlaakso

Kymenlaakso is a region in Finland. It borders to the regions Uusimaa, Päijänne Tavastia, Southern Savonia, and South Karelia.- Historical provinces :For history, geography and culture see: Uusimaa , Karelia- Municipalities :...

, eaten elsewhere in Finland

Finland

Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

 at Christmas

Christmas

Christmas or Christmas Day is an annual holiday generally celebrated on December 25 by billions of people around the world. It is a Christian feast that commemorates the birth of Jesus Christ, liturgically closing the Advent season and initiating the season of Christmastide, which lasts twelve days...

time. It is prepared by letting puréed potatoes, mixed with wheat flour

Wheat flour

Wheat flour is a powder made from the grinding of wheat used for human consumption. More wheat flour is produced than any other flour. Wheat varieties are called "clean," "white," or "brown" if they have high gluten content, and they are called "soft" or "weak" flour if gluten content is low...

, stand at a temperature of around 50°C (122°F). The amylase

Amylase

Amylase is an enzyme that catalyses the breakdown of starch into sugars. Amylase is present in human saliva, where it begins the chemical process of digestion. Food that contains much starch but little sugar, such as rice and potato, taste slightly sweet as they are chewed because amylase turns...

 in the flour will start to break down the potato’s starches to shorter carbohydrate

Carbohydrate

A carbohydrate is an organic compound with the empirical formula ; that is, consists only of carbon, hydrogen, and oxygen, with a hydrogen:oxygen atom ratio of 2:1 . However, there are exceptions to this. One common example would be deoxyribose, a component of DNA, which has the empirical...

 chains, that is sugars. The temperature cannot exceed 75°C (167°F) otherwise the amylase molecules will break down. It is through this process the dish gets its distinct sweet flavour, however nowadays corn syrup

Corn syrup

Corn syrup is a food syrup, which is made from the starch of maize and contains varying amounts of maltose and higher oligosaccharides, depending on the grade. Corn syrup is used in foods to soften texture, add volume, prevent crystallization of sugar, and enhance flavor...

can be added to give it sweetness.