Battenburg or Battenberg is a light sponge cake with different sections held together with jam. The cake is covered in marzipan and, when cut in cross section, displays a distinctive two-by-two check pattern alternately coloured pink and yellow.

The large chequered patterns on emergency vehicles in the UK are officially referred to as Battenburg markings because of their resemblance to the cake.

Bakers construct Battenberg cakes by baking yellow and pink sponge-cakes separately, and then cutting and combining the pieces in a chequered pattern. The cake is held together by apricot jam and covered with marzipan. Marzipan is a confection consisting primarily of sugar or honey and almond meal (ground almonds), sometimes augmented with almond oil or extract.

The first cake was baked in 1884 to celebrate Prince Louis of Battenberg marrying Princess Victoria, Queen Victoria’s granddaughter and Prince Philip’s grandmother.

More Info: en.wikipedia.org