What is a Battenberg cake?
Traditionally, the Battenberg is a light sponge cake that, when cut in cross section, displays a distinctive two-by-two check pattern alternately colored pink and yellow. The cake is usually held together with apricot jam, covered in marzipan and, when sliced, the characteristic checks are exposed to view.
The cake was originally created to honor the 1884 marriage between Queen Victoria's granddaughter and the Prince Louis of Battenberg, with the four squares representing the four Battenberg princes: Louis, Alexander, Henry and Francis Joseph.
(via Neatorama)