Next, stir in the sugar, cinnamon, and salt into the milk. Beat an egg with a fork in a small bowl and then add it to the hot milk mixture. Stir in the apples and raisins. Now, divide the mixture equally into the 6 custard cups. Bake the custard bowls for 30 minutes or until a toothpick inserted in the center of the baked custard comes out clean. Cool the custard bowls on a wire rack for 20 minutes. Serve the cinnamon apples warm.