Apple and blackberry crumble is a classic British dessert that combines the sweetness of apples with the tartness of blackberries. The fruit is baked until soft and juicy, then topped with a buttery crumble made from flour, sugar, and oats. The crumble becomes golden and crispy in the oven, creating a delicious contrast to the tender fruit. Serve this warm dessert with a scoop of vanilla ice cream or a dollop of whipped cream for a comforting and satisfying treat.