Preheat the
oven to 200°C/400°F/Gas mark 6. Lightly grease
the base and sides of a 38 x 25cm/15 x 10in
Swiss roll tin. Line with baking parchment,
extending over the 2 long sides.
Beat the eggs
and 75g/30z caster sugar in a small bowl with an
electric beater until thick and creamy. Sift
together the flour and cocoa and, using a metal
spoon, gently fold into the mixture.
Spread the
mixture into the tin and smooth the surface.
Bake for 10 to 12 minutes, or until the cake is
just set.
Place a tea towel on a work surface,
cover with baking parchment and sprinkle with
the remaining caster sugar. When the cake is
cooked, turn it out immediately on to the sugar.
Roll the cake up from the short side, rolling so
the parchment is on the inside. Stand the rolled
cake on a wire rack for 5 minutes, then
carefully unroll and allow the cake to cool to
room temperature. Trim the ends with a knife.
Beat
the cream, icing sugar and vanilla essence
until stiff peaks form. Spread the cream over the
cooled cake, leaving a lcm/1/2in border all
around.
Re-roll the cake, using the paper as a
guide. Place the roll, seam-side down, on a
tray.
Refrigerate,
covered, for 30 minutes. Lightly dust with icing
sugar and serve sliced.