Simple, light and no need for cooking, this mousse-style cake will be an instant hit.
Grease a 23cm spring form tin and line the base and side with baking paper. To make the base, put the dates, oats, nuts and cocoa powder into a food processor and pulse until finely ground and starting to stick together; about 2-3 minutes. Press the mixture evenly into the base of the tin, making sure to press down firmly.
To make the mousse, soak the gelatine leaves in cold water for 5 minutes, then squeeze out the excess water. Place the soaked leaves in a pan and, over a very low heat, melt slowly.
Meanwhile, whisk the double cream in a large bowl with an electric hand-held mixer or stand mixer fitted with a whisk attachment until stiff peaks form. Whisk the yogurt, icing and gelatine together in a separate bowl, then gently fold into the cream, until fully combined. Spread the mousse evenly over the top of the base layer. Cover and chill for 2 hours.
To make the chocolate ganache, put the chocolate and cream in a small heatproof bowl over a pan of gently simmering water. Heat until the chocolate has melted, then stir to combine with the cream. Set aside to cool for 5 minutes, then pour over the top of the mousse. Sprinkle the pistachios over the top, then chill in the fridge for 4 hours or overnight. Remove from the tin and slice to serve.
Decorate with fresh fruit instead of nuts. Raspberries would work very well.
To make slicing the cake easier, dip a thin bladed knife in hot water and wipe dry, then use to slice the cake.
When melting the gelatine do not let the mixture boil as this can prevent a good set being achieved.
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