Kiss your diet goodbye with this.
Grease the sides of an ovenproof ceramic deep flan dish (or similar).
Spread a layer of either brambles (blackberries) or halved plums over the bottom. How deep is a personal choice.
Spread over the top a layer about an inch or so deep of standard sponge cake mix - weight of the eggs in butter, sugar and SR flour.
Bake at 180 deg until the sponge is done.
Turn upsidedown onto a plate.
Eat hot or cold, with icecream, cream or custard, or with your coffee break.
You can make this with any fruit really, I just used plums and brambles because I have loads. It's a thin Charlotte really but with the advantage of seeing and admiring the fruit, and being able to eat it like cake