6 orange slices (optional)
1 1/2 cups low-fat or fat-free milk
1/3 cup frozen orange juice concentrate, thawed
Line the inside of two glasses with orange slices; cover with plastic wrap. Freeze until firm, 1 to 2 hours.
In a small pitcher, stir together milk and orange juice concentrate.
Remove plastic wrap and pour into the glasses. Add a few more drops of milk in the center with the tip of a spoon.