This wonderfully warming, autumnal crumble is very adaptable: I love the combination of plum and blackberries with the spices and hazelnuts, but you can use plums alone, or swap them for blackberry and apple, or just apples.
And it has one big advantage: you make the filling and topping a day or more ahead and bring them together just before you want to eat, giving you more time to spend with family and friends. And we all need a bit of that after the past 18 months.
