Instructions

1. Heat the oven to 200°C. Line a shallow roasting tin or deep baking tray, 25 x 30 cm, with a piece of non-stick baking parchment, 3–4 cm bigger on all sides than the tin. Fold the parchment in half and cut diagonally through the corners, about 4–5 cm deep. Press into the roasting tin; the cuts in the corners allow it to sit neatly in the tin.
2. Put the chocolate, water and coffee in a small saucepan and melt over a low heat. Once melted, remove from the heat and set aside to cool a little.
3. Separate the eggs into 2 medium bowls. Using an electric whisk, beat the yolks with all but 1 tablespoon of the caster sugar until pale and mousse-like.
4. With clean beaters, whisk the whites to medium-stiff peaks, then whisk in the remaining 1 tablespoon of caster sugar quickly, to stabilise the whites.
5. Stir the melted, cooled chocolate mixture into the yolk and sugar mixture, just until the mixture is marbled. Stir in one large spoonful of the whites to loosen the mixture, then add the remaining whites and carefully fold in.
6. Spread the mixture into the lined tin and bake in the upper half of the oven for about 15–20 minutes, or until a crust has formed and it is set in the middle. It will still be spongy when pressed with your fingertips.
7. Remove from the oven, carefully slide the sponge on its baking parchment onto a wire rack and immediately cover with lightly dampened kitchen paper or a damp tea towel to prevent it from drying out. Leave it to cool completely.
8. Place a piece of greaseproof paper, just bigger than the sponge, on the work surface and sift a fine layer of icing sugar onto it. Turn the sponge onto the icing sugar, using the wire rack and baking parchment to support the sponge, then peel off the parchment.
9. In a large bowl, lightly whisk the cream with the icing sugar, to taste, until it is just holding its shape; it should not be too stiff. Spread it over the cooled sponge, leaving a 1–2 cm border around the edge.
10. Make an indentation across the width of the sponge 1 cm in from the edge, using a palette knife, then using the greaseproof paper to support the sponge, roll it up like a Swiss roll, removing the greaseproof paper as you do so.
11. Wrap the roulade in the greaseproof paper and chill in the fridge for about 15–20 minutes to firm up slightly.
12. When ready to serve, carefully unwrap the roulade on a board, removing the greaseproof paper. Trim the ends with a large knife, then carefully place the roulade on a large rectangular or oval plate. Sift over a little additional icing sugar and serve with orange segments, fresh raspberries or a fruit compote.