2) Add the onion and garlic to the pan and cook until the vegetables are softened, about 5 mins. Stir in the allspice and tomatoes and cook until the juices are almost evaporated.
3) Add the chicken stock, kale, sweet potatoes, okra, bay leaves, the 7g of salt, the Scotch bonnet chilli and the thyme. Bring the liquid to a boil, then adjust the heat to maintain a gentle simmer. Cook, uncovered, until the chicken is cooked through and the sweet potatoes are tender, about 25 mins.
4) Stir in the coconut milk and the prawns and simmer until the prawns turn pale pink and are firm but not tough and rubbery, about 2 mins. Ladle the stew into warm bowls and serve.
Cooks' Note: Not for the faint of heart, Scotch bonnets are about as fiery as a chilli gets. If you can't find one, substitute a habanero.