Chocolate blackberry upsidedown cake

Blackberry topping:

270g blackberries

3 tbsp sugar

2 tbsp water

Cake:

40 g cocoa powder

150 g plain flour

½ tsp bicarbonate of soda

1 tsp baking powder

2 large eggs

125 g  sugar

200 ml milk

75 ml vegetable oil

Using a pan that is suitable for both hob and oven, approx 22cm across; heat the topping ingredients gently until the sugar has dissolved and the juices begin to run. Set aside

Preheat the oven to 200/180 fan.

Sieve  the cocoa, flour, bicarbonate of soda, and baking powder together.

Mix the remaining ingredients together, then pour into the dry ingredients and stir quickly.  Pour over the blackberry mixture, and then put the pan into the oven and cook for 30 minutes.

Let the cake cool in the pan, then place a plate over the top and invert.