Sachertorte is a traditional Austrian chocolate cake. Its history includes youthful innovation, rivalry and a battle to claim the original, making it a rather legendry cake. Trying a piece should definitely be on your list of things to do in Vienna. What is Sachertorte? With a base of chocolate sponge cake, moistened with apricot jam and topped with thick chocolate glaze, the cake is deliciously rich and decadent. The original recipe of Sachertorte is a closely-guarded secret but, nonetheless, Sachertorte comfortably remains one of Vienna’s favourite indulgences. It is so good, and such a symbol of Austrian culture, that Sachertorte even has its own national day on December 5. The…