Gluten-free Christmas Pudding

Name: Gluten-free Christmas Pudding
Prep time: 15 min
Cook time: 12 h 20 min
Total time: 12 h 20 min
Yield: 8 portions
Ingredients: 1 lemon; 1 orange; 90 g raisins; 90 g sultanas; 90 g currants; 90 g dried cherries; 1 tsp ground cinnamon; 1 tsp ground mixed spice; 1 tsp ground ginger; ½ tsp ground nutmeg; 125 g blanched almonds; 1 Granny Smith apple; 80 g unsalted butter; 90 g dark brown muscovado sugar; 30 g black treacle; 2 medium eggs; 25 g cornflour; 1 tsp gluten free baking powder; 2000 g boiling water