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Preheat the oven to 410F (210C).
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Separate the egg whites from the
yolks. Beat the yolks with both sugars until the
mixture turns light and fluffy.
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Melt the chocolate and coffee in
a small saucepan over low heal Cool. Add the egg
yolk mixture and stir well. Add 6 1/3 oz (180 g)
of butter. the almond powder. the cornstarch and
the baking powder.
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Whisk the egg whites to stiff
peaks and fold gently into the previous mixture.
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Grease and flour a pan. Pour 3/4
of the batter into the pan and bake for 15 - 20
min. Allow the cake to cool and turn it out.
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Cut the cake into two horizontal
slices. Spread the remaining chocolate batter on
the bottom layer. Assemble the cake and
refrigerate until serving.
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Prepare the Kahlua sauce: mix the
Kahlua and the cream. Top the cake with this
sauce and decorate with whole walnuts.