Apple and Blackberry Crumble with Custard

Preheat oven to 180°C (350°F/Gas Mark 4).

In a bowl, combine the sliced apples, blackberries, caster sugar, and lemon juice (if using). Mix well and transfer to a 9-inch baking dish.

To make the crumble topping, place the flour, rolled oats, brown sugar, and cubed butter in a large bowl.

Rub the butter into the flour and sugar mixture with your fingertips until it resembles breadcrumbs. Avoid overmixing.

Sprinkle the crumble mixture evenly over the fruit filling.

Bake for 30 minutes, or until the topping is golden brown and the fruit is bubbling.

Let the crumble cool slightly before serving.

Serve warm with a generous dollop of creamy custard.