Weigh out the ingredients exactly and add together in large mixing bowl.
Using an electric mixer combine the ingredients, starting off slow and then increasing speed.
The mixture will be well combined and very wet when done.
Divide the mixture into two or three (depending on size) round or rectangular non-stick loose bottom cake tins.
Bake in the oven at 300f/150c/gas mark two for an hour or until lightly browned.
Sprinkle with extra caster sugar and cut into fingers while still warm and leave to cool.
To find out more about the cookbook, please visit the Mary's Meals website.
