Preheat oven to 100°C.
Cover the outside of a 24cm spring-form tin with foil. Place biscuits into a food processor, pulse until fine and mix the melted butter into the biscuits in order to press into a spring form tin. Refrigerate the base while making the filling.
In a bowl, mix together the cream cheese, sour cream, sugar, cocoa powder and eggs. Fold in the melted chocolate until smooth then pour into the base. Place the tin into a larger tin, filled with water, then bake for about 1 hour 10 minutes or until the cheesecake is set and the middle is still slightly wobbly. Cool completely at room temperature, then refrigerate for at least 4 hours or overnight until set completely.
Place the egg whites into a bowl set over boiling water, then whisk until soft peaks form. Gradually whisk in the sugar, a tablespoon at a time, until the meringue is stiff and glossy. Pipe or spread meringue onto the cooled cheesecake, then using a blowtorch, toast the top.
Reprinted with permission of Zola Nene.
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