150²µ/5½´Ç³ú blueberries, halved
1–2 tbsp lemon juice or water
1 orange, zest only
4 tbsp brown sugar
4 tbsp caster sugar
1 tsp ground cinnamon
70²µ/2½´Ç³ú icing sugar
grating of nutmeg
oil, for greasing
420g/15oz strong white flour, plus extra for dusting
candied walnuts, to decorate
2 tsp dried fast-action yeast
40²µ/1½´Ç³ú butter, plus extra for greasing
100ml/3½fl oz milk
1 free-range egg, beaten for glazing