This is a family favourite at Christmas time. A simple chocolate sponge recipe layered with melted chocolate, smothered in cream, and rolled into the iconic Christmas 'Buche de Noel'
Line the Swiss roll with baking paper and lightly brush with a flavourless oil.
Heat your oven to 180 °C
Melt 170g of the dark chocolate in a Bain Marie (a heatproof bowl set over just simmering water, but not touching) or microwave.
Dissolve the coffee powder in 1 tbsp of boiling water and add this to the melted chocolate.
Separate the eggs into 2 medium sized bowls. Add the 170g caster sugar to the egg yolks and whisk until thick, pale, and leaving a trail with the beaters when you lift them up. Add this to the chocolate mix and fold in gently - trying to keep as much air in as possible.
In the second bowl, whisk the egg whites until almost stiff. You don't want them to be too thick and dry. Fold this carefully into the chocolate mix. I usually add in a quarter and fold that in quickly to loosen the mix, then fold in the remaining 3/4 carefully to keep the air in the sponge.
Pour the sponge mix into the lined tin, with the oiled baking paper, and cook in the pre-heated oven for 20 mins. When the time is up, leave to cool on a rack completely.
When you are ready to put the dessert together, lay a piece of baking paper on the worksurface, and sprinkle with 1 tbsp of caster sugar.
Flip the sponge onto the sugared foil and gently peel off the greaseproof paper that it cooked in.
Melt the remaining 100g of dark chocolate and spread this all over the sponge.
Whip the double cream, vanilla and the remaining 3 tbsp sugar until just holding it's shape. You don't want to over whip it. Spread this on top of the sponge covered with chocolate.
You can now either roll this lengthwise or widthwise. It's totally up to you. I would normally do this length ways, as it goes further - and with a smaller slice in our house this gives you the chance to have 2 different puddings!
You need to roll this tightly, without squeezing out the cream mixture. It will crack, but I think that adds to the look of the 'Christmas log'. Once rolled in the baking paper, I like to wrap this again in foil and place in the fridge for at least a couple of hours to firm up before serving. I like to place it on a board, dust with a little icing sugar and a couple of sprigs of holly.
Notes
This dessert will keep wrapped up in the fridge for a week. Or in you want to get ahead, you can freeze it for up to 3 months.