Mazurek is a type of pastry

Pastry

Pastry is the name given to various kinds of baked products made from ingredients such as flour, sugar, milk, butter, shortening, baking powder and/or eggs. Small cakes, tarts and other sweet baked products are called "pastries."...

 (a cake) baked in Poland

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

, particularly at Easter

Easter

Easter is the central feast in the Christian liturgical year. According to the Canonical gospels, Jesus rose from the dead on the third day after his crucifixion. His resurrection is celebrated on Easter Day or Easter Sunday...

, but also at other winter holidays. It is generally decorated with icing

Icing

Icing may refer to:* Atmospheric icing, occurs when water droplets freeze on objects they contact, very dangerous for aircraft* Aufeis, also called icing, a sheet-like mass of layered ice that forms from the freezing of successive flows of groundwater...

and fruit and nuts.

Mazurek with chocolate icing

Ingredients
All-purpose flour, sugar, butter or margarine, beaten egg (alt. egg-yolk), milk, salt, lemon juice, slivered almonds etc.
How to make Mazurek
Preheat the oven at 200°C – 390°F. Stir together flour, sugar and salt. Cut in butter. Knead the flour, butter, sugar, with cream (or milk) and yolk (or egg) to smooth dough. Cover the dough and place in a fridge for 30 minutes. Spread out until ¼ inch or so. Pat evenly into greased baking dish (or onto rectangular forms, around 15 x 13 inches) and prick with a fork. Bake in 200°C.
Chocolate icing
Melt the chocolate in a steam bath, add butter and cream. Pour the chocolate mixture onto the baked bottom of the cake, even out with spatula or a knife and decorate.