Chocolate mousse with fiery ginger shortbread and candied orange peel

Name: Chocolate mousse with fiery ginger shortbread and candied orange peel
Ingredients: 100g/3½oz dark chocolate, broken into pieces; 30g/1¼oz unsalted butter, chopped; 3 free-range eggs, separated; 25g/1oz caster sugar; 1 shot espresso; 100g/3½oz unsalted butter, softened until very soft, plus extra for greasing; 80g/2¾oz plain flour; 30g/1¼oz icing sugar; 30g/1¼oz cornflour; drop of vanilla essence; 50g/1¾oz fresh root ginger, washed, unpeeled, finely grated; 2-3 pieces crystallised ginger, sliced; 1 large orange, peel only, white pith removed, sliced into 0.5cm/¼in strips; 80g/2¾oz caster sugar; 150g/5oz demerara sugar