Winter Crumble Tart - Rest Less

Ingredients

• 225g/8oz plain flour, plus extra for dusting
• 125g/4½oz chilled butter, cut into cubes
• 30g/1oz caster sugar
• 1 large free-range egg, beaten
• 4 large Bramley apples (about 1.2kg/2lb 10oz), peeled, cored and cut into small chunks
• 150g/5½oz caster sugar
• 275g/10oz fresh blackberries
• 175g/6oz plain flour
• 100g/3½oz butter, at room temperature, cut into cubes
• 50g/1¾oz rolled oats
• 100g/3½oz demerara sugar
• 50g/1¾oz hazelnuts, roasted and chopped