INGREDIENTS
120 g
Blackberries, fresh
3
Eggs, large free-range
150 g
Blackberry jam, good-quality thick
2 1/2 tsp
Bicarbonate of soda
525 g
Caster sugar
135 g
Cocoa powder, unsweetened
100 g
Dark chocolate
300 g
Icing sugar
340 g
Self-raising flour
180 milliliters
Sunflower oil
340 g
Butter, unsalted
375 milliliters
Just-boiled water