
Saute leeks and onions in the butter until soft, but before they change colour.
Add the potatoes, stock (boiling) and oyster sauce. Boil rapidly for 10 minutes.
Add the cream and cook further for 2 minutes.
Liquidise the soup and add salt and pepper to taste.
Pass through a fine sieve.
Return to the heat, add oysters to warm through. Serve with chives and flying fish roe as garnishes.