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Preheat the oven to 200 degrees.
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Start by peeling your cooking apples. (Or, if you’re in a rush or you want the extra fibre, just give them a wash and leave as-is; it will still taste good.)
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Remove the apple cores then chop the apples into small cubes, around 2cm wide. (Again, it will still taste great if you don’t get the sizes perfect. Autumn isn’t a time for perfection.)
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Place the apples in a bowl, then wash the blackberries and add them too. Pour over the lemon juice, sugar, and cinnamon, then mix well. Pour the fruit mixture into a large oven-proof dish. (A lasagna dish works well for this, but you can also adapt and make several mini apple crumbles using smaller ramekins – just be sure to reduce the cooking time for these.)
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In a mixing bowl, combine flour and butter. Using your fingers, rub in the butter until it looks like breadcrumbs. (This takes some practice, but you can’t go too wrong – if the mixture ends up too fine, gently squish it back together then try again. If your mixture is too moist, experiment by adding a tiny bit of extra flour.)
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Add the oats/seeds mix to the crumble topping and mix through, then spread gently over the top of your filling in the lasagna dish.
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Bake for 30-45 minutes, until the fruit is soft and the filling is very hot and bubbling through the topping.
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Take out of the oven and leave to cool for a few minutes, then serve with your choice of side: custard, fresh cream, or ice cream.
This will keep happily in the fridge in an airtight container for a few days and can easily be reheated in the microwave or oven… perfect for a midweek pick-me-up or to take to a friend’s potluck.