Preheat the oven to 200C/400F/Gas 6.
Melt the butter in a small ovenproof frying pan, pour out half and reserve in a small bowl.
Add the walnuts, chopped apricots, raspberries and orange zest and juice to the pan with the butter and fry until the sauce is bubbling, about 3-4 minutes.
Scrunch up a sheet of filo pastry and arrange it to fit over the pan. Brush with some of the reserved melted butter. Repeat with the other two sheets to form a lid for the tart.
Sprinkle the top with the sugar and bake in the preheated oven for 5-8 minutes or until golden brown and crisp.
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