Sicilian lemon and orange sweet bread

Name: Sicilian lemon and orange sweet bread
Ingredients: 400g/14oz strong white flour; 7g salt; 40g/1½oz caster sugar; 10g instant yeast; 120ml/4fl oz milk; 4 free-range eggs, lightly whisked; 100g/3½oz softened unsalted butter, cut into small pieces, plus extra for greasing; 2 lemons, finely grated zest only; 1 orange, finely grated zest only; 100g/3½oz toasted flaked almonds; 100g/3½oz mixed candied peel; 100g/3½oz dried cranberries; ½ lemon, juice only; 2 free-range egg whites; 25g/1oz sugar; 25g/1oz ground almonds; 50g/1¾oz flaked almonds; caster sugar, to sprinkle