and dropping the dough into a deep fryer filled with hot oil. In this way, a sphere

Sphere

A sphere is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the same distance r from the center point...

-shaped oliebol emerges.

The dough is made from flour

Flour

Flour is a powder which is made by grinding cereal grains, other seeds or roots . It is the main ingredient of bread, which is a staple food for many cultures, making the availability of adequate supplies of flour a major economic and political issue at various times throughout history...

, eggs

Egg (food)

Eggs are laid by females of many different species, including birds, reptiles, amphibians, and fish, and have probably been eaten by mankind for millennia. Bird and reptile eggs consist of a protective eggshell, albumen , and vitellus , contained within various thin membranes...

, yeast

Yeast

Yeasts are eukaryotic micro-organisms classified in the kingdom Fungi, with 1,500 species currently described estimated to be only 1% of all fungal species. Most reproduce asexually by mitosis, and many do so by an asymmetric division process called budding...

, some salt

Salt

In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base. They are composed of cations and anions so that the product is electrically neutral...

, milk

Milk

Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to the baby and can reduce the risk of many...

, baking powder

Baking powder

Baking powder is a dry chemical leavening agent used to increase the volume and lighten the texture of baked goods such as muffins, cakes, scones and American-style biscuits. Baking powder works by releasing carbon dioxide gas into a batter or dough through an acid-base reaction, causing bubbles in...

 and usually sultanas

Sultana (grape)

The sultana is a type of white, seedless grape assumed to originate from the Turkish, Greek, or Iranian area...

, currant

Ribes

Ribes is a genus of about 150 species of flowering plants native throughout the temperate regions of the Northern Hemisphere. It is usually treated as the only genus in the family Grossulariaceae. Seven subgenera are recognized....

s, raisin

Raisin

Raisins are dried grapes. They are produced in many regions of the world. Raisins may be eaten raw or used in cooking, baking and brewing...

s and sometimes apple

Apple

The apple is the pomaceous fruit of the apple tree, species Malus domestica in the rose family . It is one of the most widely cultivated tree fruits, and the most widely known of the many members of genus Malus that are used by humans. Apple grow on small, deciduous trees that blossom in the spring...

 pieces and zest

Zest (ingredient)

Zest is a food ingredient that is prepared by scraping or cutting from the outer, colorful skin of citrus fruits such as lemon, orange, citron, and lime. Zest is used to add flavor to foods....

 or succade

Succade

Succade is the candied peel of any of the citrus species, especially from the citron or Citrus medica which is distinct with its extra thick peel; in addition, the taste of the inner rind of the citron is less bitter than those of the other citrus...

. The dough needs time to rise for at least an hour. Oliebollen are usually served with powdered sugar

Powdered sugar

Powdered sugar, also known as confectioners' sugar or icing sugar, is very fine sugar. When intended for home use, it typically contains a small amount of anti-caking agent....

, or brown sugar.

They are said to have been first eaten by Germanic tribes in the Netherlands during the Yule

Yule

Yule or Yuletide is a winter festival that was initially celebrated by the historical Germanic people as a pagan religious festival, though it was later absorbed into, and equated with, the Christian festival of Christmas. The festival was originally celebrated from late December to early January...

, the period between December 26 and January 6. The Germanic goddess Perchta

Perchta

Perchta or Berchta , also commonly known as Percht and other variations, was once known as a goddess in Southern Germanic paganism in the Alpine countries...

, together with evil spirits, would fly through the mid-winter sky. To appease these spirits, food was offered, much of which contained deep-fried

Deep frying

Deep frying is a cooking method in which food is submerged in hot oil or fat. This is normally performed with a deep fryer or chip pan; industrially, a pressure fryer or vacuum fryer may be used....

 dough. It was said Perchta would try to cut open the bellies of all she came across, but because of the fat in the oliebollen, her sword would slide off the body of whoever ate them.

A very similar type of doughnut can be found in Belgium and France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

. Croustillons are deep fried dough balls served hot and liberally sprinkled with powdered sugar. They are usually served in a paper cone with a little plastic fork to eat them with. They are typically found at fairgrounds in Belgium and in Lille, France.