The chocolate cake Sachertorte originated in which European capital city?

Sachertorte is a specific type of chocolate cake, or torte, created by Austrian Franz Sacher in 1832 for Prince Wenzel von Metternich in Vienna, Austria. It is one of the most famous Viennese culinary specialties. The 5th December is recognised as National Sachertorte Day.

The cake consists of a dense chocolate cake with a thin layer of apricot jam on top, coated in dark chocolate icing on the top and sides. It is traditionally served with unsweetened whipped cream.

Today, the Original Sacher Torte is one of the most recognized cakes in the world and even helped establish the five star Hotel Sacher in Vienna founded in 1876 by Franz Sacher's son, Eduard Sacher. Franz Sacher's recipe is a closely guarded secret. More than 360,000 cakes a year are made in Vienna by its 41 employees, many of which are shipped all over the world allowing a "taste of Vienna" to be delivered to many far away places. The most popular destinations for its cakes are Germany, Italy, France, the US, and many countries in Asia.