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Preheat the oven to 285°F/140°C. Melt the butter.
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Discard the pineapple skin and cut it lengthwise in two.
Cut into 1/4 inch (5 mm) thick slices, discarding
the fibrous parts. Heat 4 1/2 oz (130 g) of sugar
in a saucepan until it caramelizes. Place the pineapple
slices in the saucepan.
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Combine the flour with the
remaining sugar and the cocoa. Make a well. Add the
eggs, melted butter, salt, and yeast. Mix and pour the
batter into a pan. Bake for 45 min.
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During this time
prepare the ganache: grate the white chocolate. Bring to
a boil 3 fl oz (90 ml) of cream and add the grated
chocolate. Mix well and allow to cool to 850°F/300°C).
Work in the remaining cream, whipped. Set aside.
-
Turn
out the cake and allow it to cool. While it is cooling,
melt the dark chocolate in a double boiler, then pour it
onto baking paper and allow it to cool. Break the
chocolate into fragments.
Set aside.
-
Cut the cake into two horizontal slices. Pour 1 cup
(250
ml) of pineapple juice over the bottom
half and spread with ganache, keeping aside about 3
tablespoon for the top. Sprinkle the second half of the
cake with the remaining pineapple juice and place it on
top of the first.
-
Sprinkle with chocolate fragments,
covering them with the remaining ganache to fix them to
the cake. Refrigerate for 1 h.