Slice the skin and white pith from the lemon and discard it. Roughly chop the lemon flesh and flick out any pips. Quarter the pears and slice out the cores. Roughly chop the pears. Peel the banana and break it into chunks. Tip all 3 fruits into your blender.
Peel and grate in around half the ginger (or the whole thumb if you like things spicy). Tuck in the baby spinach leaves. Add a few ice cubes, pour in 300ml of the maple water and blitz for a few mins till smooth.