Light your campfire and sit and drink tea until the flames have died down.

Line the dutch oven with greaseproof paper.

Spread the apples evenly over the bottom of the pan and then sprinkle over the blackberries, tablespoon of sugar and mixed spice.

Beat together the eggs, milk, flour and oil until smooth, then pour over the fruit and pop the lid on top.

Place on a grill above the flames and cook, turning it every couple of minutes so it doesn't burn.

The cooking time will depend on the heat of your fire, and could be anything from fifteen minutes to half an hour, so keep an eye on it; when the top is dry and bounces back slightly when pressed you should be good to go! It will be paler than a traditional sponge so don't panic if it is not as golden brown as you were expecting :)