Bring the wine,
water, soy sauce, sugar, salt and pepper to the boil
and boil until reduced by half.
Mix the corn-flour to
a paste with the water, stir it into the pan and
simmer, stirring, for 2 minutes. Season the fish
with salt and sprinkle with sesame oil.
Add to the
pan and simmer very gently for about 8 minutes until
cooked. Serve sprinkled with spring onions.