Nutrition: Per serving
Mix the flour, sugar, suet and ½ tsp salt together in a bowl. Crack in one egg and slowly add 150ml ice-cold water, stirring to make a pliable dough. Knead briefly to bring together, then wrap and leave to rest while you make the filling.
Tip the grated apples into a bowl, then stir in the cinnamon, melted butter, sultanas and sugar until well-combined. Set aside (don’t worry if it starts to turn brown).
Heat the oven to 200C/180C fan/gas 6. Roll the pastry out on a floured surface to a 30 x 25cm rectangle, with a long side closest to you. Spoon the apple filling along the long side, leaving a 2cm border from the edge. Beat the second egg and brush some of this over the exposed pastry edge, then fold the edge over to encase the filling. Roll the pastry up into a tight roll, then put the kettle on to boil.
Wrap the whole roll in a large piece of baking parchment and twist the ends like a Christmas cracker. Twist again to tighten, then secure the ends with kitchen string. Put on a wire rack inside a large roasting tin, pour in 1 litre of freshly boiled water from the kettle and sit the clanger on the rack. Cover the whole tin tightly in a tent of foil, then transfer to the oven and bake for 1 hr.
Once the clanger is steamed, carefully remove from the tin. Will keep chilled for up to a day. Unwrap the clanger, transfer to a baking tray, brush all over with more of the beaten egg, scatter liberally with more demerara sugar and bake for 20 mins more until deep golden. Serve with custard.
