Grease and line a 20cm/8 inch springform pan.
Preheat oven to 180℃/350℉.
Melt butter and allow to cool a little.
Mix dry ingredients - flour, sugar, ensuring all flour becomes brown-ish. Unlike the hand-written recipe I added the cinnamon to the dry ingredients too, and then sprinkled more on top. This was totally tasty.
Add fruit to the dry ingredients and mix well.
In a separate bowl, beat eggs with a fork until lightly frothy.
Add eggs and melted butter to the mixture and mix well. The mix will be quite dense, don't worry.
Pour into prepared pan and spread evenly. Sprinkle with caster sugar and extra cinnamon.
Bake for 40 minutes or until cake comes away from sides of pan and a skewer comes out clean.