Despite appearances, Swiss rolls are in fact very simple to make. The cake itself has no butter in it, so you can feel justified in spreading it with lashings of jam and whipped cream. Use any kind of jam you like; apricot or blackberry, for instance, would do just as well as raspberry or strawberry.
Preheat the oven to 190ºC (375ºF), Gas mark 5. Line the base of the 25 x 38cm (10 x 15in) Swiss roll tin with greaseproof paper, brush the base and sides of the tin with melted butter and dust with flour.
Whisk the eggs and caster sugar together in a large bowl or in an electric food mixer until light and fluffy, then add the water and vanilla extract.
Sift in the flour, about one-third at a time, and fold it into the mixture using a large metal spoon.
Pour the mixture gently into the prepared Swiss roll tin and bake in the oven for 12–15 minutes, or until the centre of the cake is slightly springy and the edges have shrunk a little from the sides of the tin.
Spread out a piece of greaseproof paper (slightly larger than the tin in size) on a work surface and sprinkle evenly with caster sugar (this stops the roll from sticking to the paper). Turn the
Swiss roll tin onto the sugared greaseproof paper, then carefully remove the tin and greaseproof paper from the bottom of the cake.
Place a slightly damp, clean tea towel over the cake while it cools – this will prevent it drying out and cracking when you roll it.
When the cake is cool, spread it sparingly with raspberry jam, followed by the whipped cream. With the longest side facing you, roll up the Swiss roll away from you, then transfer to a plate to serve. Sprinkle with caster sugar or dust with icing sugar to finish.
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