A really quick fine-dining type recipe! The approximate American weights are given in brackets. You can assemble this soup a day ahead, and keep it in the fridge to heat gently just before serving. Please adjust to your taste. Use the best quality canned mushroom soup and smoked oysters -- it makes a big difference to the end result. It IS rich, no excuses, but is served in very small portions -- not as generous as my photo seems to indicate! PS: I think that 2 cans of oysters might be better than just one and will improve the flavour. If you find the cup of cream too much, use a 1/2 cup plus 1/2 cup chicken broth (or more mushroom soup).