500g-600g canned condensed milk
1 large Bramley apple, peeled, cored and sliced
2 Cox's apples, peeled, cored and sliced
50g light muscovado sugar
Freshly grated nutmeg, to sprinkle
250g plain flour, plus extra for dusting
Preheat the oven to 140°C/285°F/Gas 1. Put the unopened cans of condensed milk in a deep, flameproof casserole dish. Cover the cans with water and bring to the boil on the hob. Cover with a lid and transfer to the oven for 3½ hours. Remove the cans from the water and set aside.
To make the pastry, put the flour and icing sugar in a bowl. Add the butter and reb in with your fingertips until the mixture resembles breadcrumbs. Work in the egg and yolk to form a dough, then wrap in clingfilm and chill in the fridge for 30 minutes.
Preheat the oven to 180°C/350°F/Gas 4. On a lightly floured work surface, roll out the pastry to the thickness of a £1 coin and use it to line a 23cm loose-bottomed flan tin. Prick the base with a fork, then line the pastry case with crumpled greaseproof paper. Fill with ceramic baking beans, dried pulses or rice, and bake in the oven for 15-20 minutes.
Remove the paper and baking beans, then return the pastry case to the oven for a further 5 minutes, until evenly golden. Set aside to cool.
To make the filling, put the apples, orange juice and muscovado sugar in a saucepan and heat gently until the fruit it pulpy and quite dry. Set aide until completely cold.
To assemble the pie, open the cans of condensed milk and empty the toffee into the pastry case, spreading it out evenly. Spread the apples on top of the toffee. Whip the cream with the caster sugar and ground cinnamon until it forms soft peaks, then spread over the apples. Sprinkle with a little ground nutmeg to serve.