Vegetarian mince pies

Ingredients

• 1 large cooking apple, peeled, cored and cut into large chunks
• 2 oranges, finely grated zest and juice
• 125 g butter, chilled and grated
• 140 g raisins
• 280 g sultanas
• 60 g mixed candied peel, chopped
• 325 g soft light brown sugar
• 30 g walnuts, chopped
• 1 tsp mixed spice
• 1 tsp cinnamon
• 35 ml brandy
• 200 g plain (all-purpose) flour, sifted
• 1 tbsp icing (confectioners') sugar, plus extra for dusting
• 100 g chilled butter, cubed
• 1 medium egg, beaten, plus extra for glazing
• 1 x half an orange, zest only