<Tr> <Th> Variations </Th> <Td> Various limited edition flavours (Lemon and lime, strawberry, black currant) </Td> </Tr> <Tr> <Td_colspan="2"> Cookbook: Jaffa Cakes Media: Jaffa Cakes </Td> </Tr> <P> Jaffa Cakes are biscuit - sized cakes introduced by McVitie and Price in the UK in 1927 and named after Jaffa oranges . The most common form of Jaffa Cakes are circular, 2 ⁄ inches (54 mm) in diameter and have three layers: a Genoise sponge base, a layer of orange flavoured jam 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 . </P> <P> Because McVitie's did not trademark the name "Jaffa Cakes", other biscuit manufacturers and supermarkets have made similar products under the same name . The product's classification as a cake or biscuit was part of a VAT tribunal in 1991, with the court finding in McVitie's favour that the Jaffa Cake should be considered a cake for tax purposes . In 2012 they were ranked the best selling cake or biscuit in the United Kingdom . </P>

Are jaffa cakes a biscuit or a cake