Place the cashews in the 200ml boiling water and set aside to soak – 20 minutes or more is sufficient, so they will be ready when the soup is finished.
Dice courgette and onions, then gently fry in oil with regular stirring for around 10 minutes, during which the onions will turn transparent then start to go golden and aromatic
Add stock, spinach and parsley to the pot and simmer for 15 minutes
Blend soup to make it smooth
Blend cashew and water mixture until smooth and stir in to the soup