- Preheat oven to 160°C/140°C fan assisted.
- Place the eggs, sugar and salt in a large mixing bowl and whisk until a thick and creamy, mousse like appearance.
- Fold in the cocoa powder.
- Pour onto a Swiss roll baking tin and gently tap to eliminate any bubbles.
- Cook in the oven for 8-10 minutes, until springy to the touch.
- Allow to cool.
- To create the filling, mix together the dark chocolate, icing sugar and vanilla essence.
- Separately whip the double cream.
- To create the chocolate fudge buttercream, in a separate bowl, mix the icing sugar and butter using the flat beaters until combined, adding the warm water.
- Turn out the cake onto a lightly dusted parchment paper and add filling mixture.
- Add the whipped double cream, being careful not to go right to the edges.
- Using the parchment paper, gently start to roll the sponge to form a Swiss roll.
- Cover the log with chocolate fudge buttercream, using a fork to run across the top lengthways.
- Leave to set in the fridge and dust with icing sugar just before serving.
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Top Tip
- Try adding the chocolate fudge buttercream inside the log, or spread with blackcurrent jam.
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