About this recipe:This chocolate cheesecake is unique and memorable; perfect for a show-stopping end to a meal. It's made with mascarpone instead of cream cheese, and calls for gianduja chocolate, which is a sweet chocolate containing about 30% hazelnut paste. In a pinch, you can use good quality plain chocolate instead of the gianduja.
4 sheets filo pastry
110g butter, melted
225g gianduja chocolate, chopped
30g cooking chocolate, chopped
900g mascarpone cheese
150g caster sugar
4 egg yolks
60ml hazelnut liqueur
4 egg whites
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Preheat oven to 150 C / Gas 2. Butter a 23cm springform cake tin. Lay one sheet of filo pastry in the tin. Tuck it into the tin and let the edges overhang the rim. Brush with butter and layer a second sheet of filo. Butter this sheet. Continue until you have used all four sheets of filo. End with butter. Use as little butter as possible. Cover the filo-filled tin with a damp cloth.
In the top of a double boiler, heat gianduia chocolate and cooking chocolate, stirring occasionally, until chocolate is melted and smooth. Remove from heat and allow to cool to lukewarm.
In a large bowl, beat the mascarpone cheese until smooth. When no lumps remain, begin to beat in the sugar a little at a time. Beat in the egg yolks one at a time incorporating each yolk completely before adding the next. Finally beat in the melted and cooled chocolates and the liqueur.
Beat the egg whites until they just get stiff. Do not over beat. Fold 1/3 of the egg whites into the cheese mixture, then quickly fold in the remaining whites until no streaks remain. Be careful not to deflate the whites as much as possible. Pour the filling into the filo-lined tin. Tuck the edges of the filo into the tin making a bit of a rim.
Bake in the preheated oven for 45 to 60 minutes, or until filling is set. It will still be a little wobbly in the centre. When the cake appears done, turn off the oven, prop open the oven door with a wooden spoon and let the cake remain in the oven for another hour. Then place the cake in the refrigerator until completely chilled.