Put all of the prepared fruit and raisins into a shallow, rectangular ovenproof dish, approximately 28 x 20 cm (11 x 8 inches). Drizzle over the reserved pear juice.
Mix together the dry topping ingredients in a large bowl. Pour over the melted butter and combine until the mixture resembles large breadcrumbs. Sprinkle over the fruit and press down firmly.
Place in a preheated oven, 180°C (350°F), Gas Mark 4, for 40–45 minutes or until golden and crisp. Serve with fat-free Greek yogurt, if liked.