For the marinated prawns
For the soup
Prepare the marinade for the prawns by combining all the ingredients in a glass bowl. Add the prawns and allow to marinate for 2 hours in the fridge.
For the soup, add all the ingredients in a blender and blitz until smooth. Pour into a large jug and place in the fridge until needed.
Remove the prawns from the marinade, heat a griddle pan over a high heat and grill each prawn for 2-3 minutes on each side, brushing with the marinade when turning.
Serve immediately with the chilled avocado and cucumber soup.