Thoroughly rinse produce and pat dry.
If desired, zest orange. Then peel orange and separate into segments.
Only zest the outer part. This outer part contains flavorful oils, while the white pith underneath is bitter.
Blend the Smoothie
Place orange segments, orange zest, all other ingredients, and 2½ cups ice in a blender.
Blend until smooth, 3-5 minutes.
Pour into two glasses and serve immediately.