450g/1lb apples, peeled, cored and cut into 1cm/陆in pieces (see recipe tip)
300驳/10陆辞锄 plain flour
1 tbsp plain flour
175g/6oz brown sugar
50g/2oz brown sugar
1 pinch ground cinnamon
pinch of salt
200g/7oz unsalted butter at room temperature, cubed, plus a little for greasing