This ebony-dark, shiny, intensely sweet chocolate glaze was originally invented to coat Sachertorte, but it’s a great icing to use for many other baked goods. The authentic icing must be cooked into syrup that hardens to a fudge-like consistency (some bakers also temper the syrup, a difficult optional step). Schokoladeglasur stays glossy at any temperature, as long as the cake has an undercoat of preserves. Be sure to allow the undercoat to cool and set before applying the chocolate glaze, and use the chocolate glaze immediately after making it, while it is still warm and fluid.
What to do with the leftover glaze that inevitably drips off the pastries and ends up underneath the cooling rack? It makes great hot chocolate! Scrape it up and store it in a covered container in the refrigerator. When you want a cup of hot chocolate, place milk and a few tablespoons of the chocolate glaze to taste in a small saucepan. Heat over low heat, whisking often, to warm the milk and melt the glaze.