50g cocoa powder, plus extra for dusting
75g Self-Raising Flour
1 tsp baking powder
5 large eggs
100g caster sugar, plus extra for dusting
1 jar of Damson Plum Jam
50g icing sugar
200g dark chocolate, melted
Heat the oven to 190C/fan 170C/gas 5. Line a 30x40cm swiss roll tin with baking parchment, butter and dust with cocoa.
Sift the flour, baking powder and cocoa into a bowl. Beat the eggs and caster sugar with an electric mixer until thick, pale and trebled in volume, about 8 minutes. Fold in the flour mix with a large metal spoon - the less air you squash the better, so do this carefully but quickly. Pour into the tin, tipping the tin as your pour so the batter is even. Bake for 10-15 minutes or until firm to the touch.
Cool the sponge for 2 minutes then turn it out onto a piece of baking parchment dusted with caster sugar. Peel off the lining paper and roll the sponge up using the paper underneath. It may crack a bit but don't worry, you're going to cover it with icing. Cool.
For the filling, melt the Damson Plum Jam slightly so it has a runnier consistency.
For the topping, beat the butter and icing sugar together and fold in the melted chocolate. Leave until cool enough to spread.
Gently unroll the sponge and spread the jam out gently. Reroll the roulade as tightly as you can, using the paper to help you, without squashing out the filling.
Spread the topping over the roulade using a palette knife to give a rough surface and dust with cocoa or icing sugar.
Serves 10. Ready in one hour