This delicious cake recipe appeared in the most famous Swiss cooking magazine (Betty Bossy Zeitung) in 1988. It has recently also appeared in a special edition cook book on dishes that made history. I've known this cake for many years already and the recipe must be used in many Swiss households, as otherwise it wouldn't appear in the cookbook mentioned. Rhubarb is very popular here and nearly everybody who owns a house grows rhubarb in the garden. There are many rhubarb recipes, but this one is special because the sour rhubarb in the dough is combined with the sweet chocolate glaze. A marriage made in heaven!