This is a famous Swedish dish, but not one for slimmers. Theories conflict about its origin. One account has the eponymous Jansson, one Erik Jansson, a deeply religious man who was forbidden any enjoyment by his church, succumbing to one temptation and his name was thus immortalised. Another version attributes the dish to a Swedish opera singer called Adolf Janzen, a socially ambitious fellow who liked to give his sophisticated friends food with a peasant o