"Let them eat cake - for breakfast," says Curtis Stone. "Here a brown sugar and cinnamon streusel is swirled throughout as well as sprinkled on top. Once you make homemade marmalade, there's no going back; this ruby grapefruit marmalade adds to the breakfast appeal of this cake."
Cake flour is available from select supermarkets. To make your own, remove 2 tbsp from each cup of plain flour, and replace with 2 tbsp cornflour.