The pear, grapes, orange, and banana make for a sweet-enough smoothie while still providing the nutritional benefits from the kale.
I thought these grapes were ripe, but I see now they are quite sour.
1 cup green grapes
1 cup kale
1 orange (peeled)
1 banana (optional)
Fill blender with as much water/ice as you like and add kale. Blend until smooth then add fruit. Pulse blend until desired consistency.