Wilt the spinach. I like to pop the spinach in a colander and pour over a kettle full of boiling water, then pour cold water over the spinach to refresh it, then squeeze out the excess water before drying on a clean tea towel.
Add the orange juice, spinach, raspberries and banana to a food processor and whizz until smooth.
Add the milk and yoghurt and whizz until combined.
Strain the smoothie through a sieve to catch any large pieces of spinach.