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Decore the apples and place on a plate, fill the middles with caster sugar (1tbsp in each) and place in the microwave. In a 750W microwave, the apples will soften after around 8-10 mins, for a 650W you will need it in for slightly longer.
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Once the apples have softened, remove from the microwave and scoop the soft flesh from out of the skin into a bowl along with any sugar that has run onto the plate.
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Put the blackberries in the bowl with the apple and mix with a spoon gently crushing the blackberries so they start to break down.
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Place the fruit into an oven proof dish and make the crumble.
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To make the crumble, in a bowl place the flour, butter and sugar and rub together with your hands until you get a crumbly consistency, place this on top of the fruit and place in the oven for 30 mins on gas mark 4/180c until crumble is browned.

