Rich and delicious, use a good Dijon type mustard that you pick up in your local cheese shop, or on the gourmet isle of a grocery, it is okay to use some whole mustard, if you like that flavor, but only a few teaspoons of it. This recipe will serve six persons, but I find it never does, use it as part of a rich meal. As long as the butcher slices the scallops thinly, no pounding will be required, I have treated them.