Boil butternut squash until soft, reserve one cup of broth and drain.
Heat oil to medium. Fry together prawns, onion and garlic until the prawns are cooked.
Remove from the pan, reserve the prawns and transfer the fried onion, garlic and all the juices from the pan into the pot with boiled squash.
Add the reserved broth, fresh ginger, ground coriander, salt and pepper and blitz until smooth.
Return to the stove, add chicken stock and bring to simmer. Stir in the coconut milk and remove from heat; add the salt and adjust to perfection.
To serve, divide the prawns between plates, pour in the soup, season with freshly ground black pepper and sprinkle with coriander leaves.