Chocolate brownie meringue cake with raspberry cream

g/7oz good-quality dark chocolate roughly chopped

g/7oz unsalted butter, softened, plus extra for greasing

g/8¾oz icing sugar

free-range eggs

g/4oz plain flour

free-range egg whites

g/7oz caster sugar

cream of tartar

g/3½oz hazelnuts, roasted, chopped

ml/10½fl oz whipping cream

g//3½oz icing sugar

g/7oz raspberries

hazelnuts, chopped

pistachios, chopped