Some recipe ideas develop spontaneously. Like the idea for this cake. It started when my favourite colleague asked me if I had a good recipe for a rhubarb streusel cake. Instantly the custard streusel cake come to my mind. Rhubarb and vanilla pairs so greatly and so I suggested to add another layer to the custard streusel. My colleague liked the idea as well and after a short discussions we decided that the rhubarb should be slightly cooked and then bound with some starch like a custard. When I bought my groceries this evening, I saw rhubarb in the fruit section of the supermarket and decided that I had to bake this cake as well. And I’m happy that I did it, because the combination of rhubarb, custard, streuel and a fluffy yeast dough is really divine!