crumble topping with walnuts

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100g plain flour
50g unsalted butter, cold and cut into squares (plus more for greasing dish)
60g walnuts (shelled weight)
45g light brown sugar

bung all this in a food processor, and whizz till it resembles coarse breadcrumbs.

put on top of some fruit - whatever you fancy, really. Today I'm doing rhubarb and fresh ginger.

cook in oven preheated to gas 5 / 190C for about 25 mins.