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Preheat the oven
to 190°C/375°F/Gas mark 5. Butter a deep
20cm/8in round cake tin generously and line the
base with baking parchment.
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Beat the butter into
the chopped nuts until the mixture is very
creamy. Sift the flour with the baking powder,
then add the flour to the nut mixture.
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Beat the
egg whites with the salt until they form soft
peaks. Sprinkle on the sugar and continue
beating until the meringue holds fairly stiff
peaks.
-
Stir one quarter of the meringue into the
nut mixture to lighten it, then delicately fold
in the rest. Turn the batter into the prepared
tin and bake in the oven for 20 to 25 minutes,
until the cake has risen nicely.
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Remove
the tin to a wire cooling rack. After 10 minutes, run a
knife around the inside edges, un-mould the cake
and remove the baking parchment.
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To make the
butter cream, beat the butter, sugar and 2
tablespoons rum into the nuts.
When the cake has cooled completely, slice it in
half horizontally.
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Sprinkle the cut sides with
the remaining rum, then spread one half with one
third of the butter cream.
-
Sandwich the other
layer on top and spread the top and sides of the
cake with the remaining butter cream.