Combine chopped apple witn the blackberries, add caster sugar cornflour, lemon juice and few drops of vanilla extract. Place mixture in overnproof dish.
Put flour and butter in a food mixer and process to breadcrumb stage or rub in. Stir in granulated sugar. Place on top of the fruit mixture and swirl with a fork.
Cook at gas mark 6 for about 40 mins until browned and bubbling. Serve with lots of custard.
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