This will ensure that your scallops are cooked through and opaque and that your topping develops a nice crunch. You can always finish off with a minute or two under the broiler if needed.

Broil about four inches from the heat for eight to 10 minutes or until scallops are opaque, turning and brushing with the remaining melted butter halfway through broiling. Outdoor cooking ...

Take care not to over-cook them: serve as soon as they are firm and opaque. You’ll need about four to five king scallops per person for a main meal or about a dozen queen scallops.

(The scallops should have turned opaque, but remain sweet and tender.) Serve the scallops and crab Mornay with a crisp green salad and a glass of chilled white wine.