Peel the kiwis: cut off both ends, then slide a spoon between the skin and the flesh and turn it around the fruit. Quarter the flesh.
Add the orange juice and yogurt to the blender first, then the spinach, kiwi and banana, with the ice on top.
Blend on low for a few seconds, then on high for about 45 seconds, until completely smooth and no spinach flecks remain.
Taste and add honey or lime juice if needed, then blend again briefly.
If the smoothie is too thick, add a splash more juice or milk; if too thin, add a few more ice cubes or frozen fruit.
Pour into glasses and serve right away.