-
Line a
33 x 23cm/13 x 9in Swiss roll tin with baking
parchment.
-
Mix the cocoa powder with 3 tablespoons milk to
form a paste. Heat the remaining milk in a small
pan, then slowly pour on to the cocoa paste and
stir together to combine evenly. Cool for 10
minutes.
-
Preheat the oven to 180°C/350°F/Gas
mark 4. Whisk the egg yolks with the sugar in a
freestanding mixer until pale, thickened and
mousse-like.
-
Gradually mix in the cooling
chocolate milk.
Whisk the egg whites in a bowl until they form
stiff peaks. Gently fold a third
into the chocolate mixture, to loosen slightly,
then fold in the remainder.
-
Turn into the
prepared Swiss roll tin and bake for 25 minutes
until the mixture has risen and is just firm to
the touch.
-
Turn out on to a sheet of baking
parchment dusted with 2 tablespoons caster sugar
and remove the baking parchment lining. Cover
with a warm damp tea towel to prevent the sponge
from
drying
out.
-
Put the Mascarpone into a bowl and stir in the
maple syrup and cream. Put the banana
slices in a small bowl, pour on the vanilla
essence and stir to mix.
-
Remove the tea towel
from the chocolate sponge and, using a palette
knife,
spread half the Mascarpone cream over the
sponge. Scatter the banana on top.
-
Starting at the shortest end, roll up the
chocolate sponge. Slide on to the serving
plate and serve in slices with the rest of the
Mascarpone cream.