This is a light version of the Scottish Atholl Brose, a rich dessert with an amusing history. It is said that the dessert, originally a mixture of whisky, cream and honey, was used to capture a robber called Big Rory, who stole from passers-by in the woodlands of Lord Atholl. A young man noticed that Rory drank from the same well every day and filled the well with Atholl Brose. Rory became drunk and was captured by the young man who then married Lord Atholl's daughter. This recipe includes raspberries, and it replaces the cream with yoghurt. It is still quite rich, so serve it in small portions.