French Classic Tuiles with Chocolate Mousse

For the chocolate mousse

g/7oz dark chocolate

ml/10½fl oz double cream

large free-range egg, white only

g/1¾oz caster sugar

For the tuiles

g/7oz butter, softened

g/6oz icing sugar

vanilla extract

large free-range eggs, whites only, lightly beaten

g/7oz plain flour

cocoa powder

g/1¾oz plain chocolate, melted