Apple & Plum Pine Nut Crumble Tart

Pastry 125g unsalted butter, room temperature 50g caster sugar 1 medium egg, lightly beaten 200g plain flour Pinch of salt Lightly cream the butter and sugar, then mix in the beaten egg. Sift the flour and salt into the bowl and gently mix to form a dough. Clingfilm and chill...