Defrost scallops, wipe dry and add in marinade in order listed. Mix well before adding each seasoning. Add cornstarch last and marinade for about 30 minutes.
Remove shell of shrimps, and rinse with salt water then wipe dry. Using back of knife, mash prawns into paste, add in salt, and stir vigourously until elastic. Spoon up whole of paste and drop paste into bowl several times. Add in chicken powder, egg white, cornstarch and mix well. Place in refridgerator for about 1 hour.
Take out shrimp paste, divide into portions equal to number of scallops. Coat scallops with a little cornstarch then spoon shrimp paste onto scallops. dip into a little bit of egg white, then coat again witha thin layer of cornstarch.
Put a small piece of chinese parsley on each piece of scallop. Arrange on plate, then steam over boiling water for 15 minutes.
Bring thickening sauce to the boil, then pour onto scallops and serve.