First, peel the avocado and remove the pit. Combine all ingredients in a blender and blend until the mixture is completely smooth. For an extra thick, ice-cream-like shake, you can blend in a few coconut milk ice cubes. To make these, simply freeze canned coconut milk in an ice cube tray. Avoid using regular ice cubes as they will dilute the smoothie’s flavor. Serve the shake cold. Any leftovers can be covered and stored in the refrigerator for up to three days. This recipe yields approximately 2 cups of smoothie.