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Heat oven to 190C/170C fan/gas 5. Put everything for the apple layer, except the lemon juice and apples, into a bowl and microwave on High for 1½ mins until the butter has melted and the sugar is syrupy. Toss in the apples and lemon juice, then spoon into a medium baking dish, making sure the dried fruit is evenly distributed.
Rub the flour and butter together, first into fine crumbs, then keep going until the mix forms bigger clumps, a bit like a rough biscuit dough. Stir in the sugar, oats and almonds. Scatter over the fruit, then cover with foil and bake for 1 hr, removing the foil for the final 30 mins, until golden and bubbling. Rest for 10 mins, then serve with custard or ice cream.