ISO Broiled scallops: Malibu / Santa Monica / Venice area
I don't know for sure, but you might want to check the menus or call for daily specials at The Lobster, and at Ocean Avenue Seafood. These are both good seafood restaurants in Santa Monica on Ocean Avenue, although I can't personally attest that they have broiled scallops all the time.
You might also check the restaurant in the hotel Casa Del Mar. I haven't been, but they've recently opened as a seafood place.
In Malibu try Geoffreys, Moonshadows, Charthouse and Allegria. Or, for a more casual seafood place, try Malibu Seafood.