Bring 3 cups water to a boil in a medium saucepan over high heat. Add barley, bring water to a boil, and then reduce heat to low. Cover and cook 35 to 40 minutes or until most of liquid is absorbed. Stir in walnuts, brown sugar, cinnamon, and nutmeg. Add ½ cup milk, stirring until mixture is creamy, barley is tender and most of the liquid is absorbed. Add an additional ½ cup milk, if necessary, to reach desired consistency.
Divide barley evenly among 3 bowls. Top each bowl with apples.
