Preheat the oven to 180℃/350F fan, 200℃/400F or Gas Mark 6.
Cut the apples into 2cm cubes and place in an ovenproof dish with the blackberries, brown sugar, plain flour, zest and juice of the lemon and water. Mix everything together well.
Make the topping by combining all the ingredients together in a bowl and rubbing together with your hands until it’s crumbly and there’s not big clumps of butter.
Scatter the topping mixture over the apples and blackberries and bake for 30 minutes until the top is golden and crunchy.
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Calories: 873kcal | Carbohydrates: 105g | Protein: 14g | Fat: 49g | Saturated Fat: 17g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 16g | Trans Fat: 1g | Cholesterol: 65mg | Sodium: 208mg | Potassium: 666mg | Fiber: 17g | Sugar: 57g | Vitamin A: 1077IU | Vitamin C: 34mg | Calcium: 157mg | Iron: 5mg