1 hour ago, kayb said:
Now this is plumb fascinating. Is it a typical dish in your part of the world?
The method is from Jacques Pepin's 'Complete Techniques' (pub. 2001). This time scallops other times mixed seafood or when dock prices drop lobster. Lots of options.
Edited to answer your question.
It's not typical to make this dish. A much more common use would be scallops as part of a seafood chowder. Another use would be in a seafood pie (similar to a shepherd's pie but seafood in a white sauce topped with a potato crust).