1. In a pot, bring the water to the boil with the sea salt.
2. Add the fish heads, onion, celery, carrot, garlic and bay leaves and return to the boil, then reduce heat to a gentle boil and cook until the heads are done – approximately 8-10 minutes depending on size.
3. Carefully remove the heads using tongs or a slotted spoon and when cool enough to handle pick the flesh from the bones.
4. Bring the stock back to a boil and add the coconut milk, 1½ cups hot water, smoked paprika, miso, kūmara and rice – reduce heat and gently boil for 20 minutes or until rice and kūmara are cooked.
5. Add the clams (or mussels), shiitake, silverbeet and corn and cook 3 minutes more or until all shells have opened.
6. Taste for seasoning.
7. Place fish flesh in each bowl then ladle the broth on top.