Place the zest and juice of the oranges and lemon in a large (11-inch) ovenproof pot or Dutch oven, such as Le Creuset. Peel, quarter, and core the apples and add them to the pot, tossing them with the juices as you go.
Add the brown sugar, butter, cinnamon, and raspberries, cover, and bake for 1 to 1 1/4 hours, until the apples are very soft. Stir vigorously with a wire whisk. The applesauce will be smooth but still have a lot of texture. Serve warm with a scoop of ice cream and a dusting of orange zest.