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Grind Marie biscuits finely.
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Mix grounded Marie biscuits with flour and salt.
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Add ground almonds and mix well.
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Separate egg yolks from egg whites.
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Cream butter, add egg yolks and vanilla extract gradually. Beat until soft and fluffy for 10 minutes.
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Add flour/almond mixture to butter mixture and mix well.
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Beat egg whites until foamy. Gradually add sugar and beat until egg whites form stiff peaks.
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Add egg white mixture to batter and fold gently.
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Add in chocolate rice and fold gently.
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Carefully pour cake mixture into a greased 9 inch round pan, lined with parchment paper.
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Tap pan lightly on a hard surface to remove any trapped air in the batter. Place towel below pan to protect table.
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Bake in preheated oven at 180 C for about 40 to 50 minutes. Cake is cooked if skewer inserted into deepest part comes out clean.
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Place on a cooling rack before unmolding.