Spread a layer of rock salt over a baking sheet/tray. Set the oysters into the salt, rounded-side down. Roast until the top shells start to loosen and the oysters start to open, about 15 minutes.

Add the spring onions and mix briefly, then stir in the roast pork. Pour the stock and seasonings into the pot and bring to the boil, then stir in the fried oysters and gluten puffs. Cover the pot ...