Jaffa Cakes are a snack introduced by McVitie and Price in 1927 and named after Jaffa oranges, and now manufactured by numerous companies including McVities, Cadbury and other biscuit manufacturers, Tesco and other supermarket chains, etc.
The most common form of Jaffa Cakes are circular, 21⁄2 inches (64 mm) in diameter and have three layers: a sponge base, a layer of orange flavoured jelly and a coating of chocolate. Jaffa Cakes are also available as bars or in small packs, and in larger and smaller sizes. The original Jaffa Cakes come in packs of 12, 24 or 36.
Jaffa Cakes are consumed primarily in the United Kingdom and Ireland. McVitie's did not trademark the name "Jaffa Cakes" and so other companies such as Tesco, Sainsbury and Aldi also make products under the name Jaffa Cakes.
Answer by Alisim at 12:30 PM on Feb. 1, 2013