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First make the topping. Put the flours in a bowl with a pinch of salt, then rub in the butter with your fingertips to form crumbs. Stir in the sugar with a fork, and chill until needed.
Heat oven to 180C/160C fan/gas 4. Tip the apples, plums and sugar into a big saucepan with 50ml water and cook, stirring, for about 5 mins, until the apples are soft and juicy. Stir in the figs and blackberries, and tip into a baking dish. Scatter over the crumble and bake for 45-55 mins until the topping is golden and the fruit is bubbling.