This layered, chocolate-topped apricot and walnut cake was invented by a Swiss chocolatier named Émile Gerbeaud—pronounced zserbó in Hungarian, hence the name—who moved to Budapest in 1884 to take charge of Kugler coffee house and pâtisserie, which is now the famous Café Gerbeaud.
"Go to celebrated Gerbeaud in Vörösmarty Square for its eponymous Gerbeaud slice (Zserbó szelet), made of chocolate, walnut and apricot jam."