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Preheat the oven to 180°C/350°F/Gas mark 4.
Grease a 33 x 23cm/13 x 9in Swiss roll tin and
line with greaseproof paper.
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Melt 100g/4oz
chocolate in a heatproof bowl set over a
saucepan of simmering water. Leave the chocolate
to cool.
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Whisk the egg yolks with the sugar
until pale and fluffy. Add the water, melted
chocolate and cocoa and whisk well to combine.
Stiffly whisk the egg whites and lightly fold
into the mixture.
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Turn the mixture into the
prepared tin and level the surface. Bake for 20
minutes, until well risen and firm to the touch.
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Remove from the oven, leave in the tin and cover
with a sheet of greaseproof paper and a damp tea
towel. Leave at room temperature overnight, The
next day, dust a large sheet of greaseproof
paper with caster sugar.
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Turn the cake out on to
the paper and remove the lining paper. Stiffly
whip the cream and fold in the creamed coconut.
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Spread half of the cream over the chocolate
mixture and roll up, like a Swiss roll. Cover
the roll with the remaining coconut cream and
arrange the toasted coconut down the centre.
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Melt the remaining chocolate and drizzle over
the roll. Leave to set before serving.