Prepare shrimp inside a 4-quart pot of boiling salted water* until just cooked through, about 1 1/2 minutes. Drain shrimp inside a colander, then immediately transfer to some large bowl of cold water to prevent cooking.
Preheat oven to 350°F.
Mash garlic clove to some paste with 1/4 teaspoon salt utilizing a mortar and pestle (or mince and mash garlic clove with salt utilizing a large knife), then stir along with fresh and dried herbs, shallot, onion, 1 1/2 sticks (3/4 cup) butter, 1 cup bread crumbs, nutmeg, mace, 3/4 teaspoon salt, and 1/4 teaspoon pepper.
Melt remaining 1/2 stick butter and stir along with remaining 1/2 cup bread crumbs, 1/2 teaspoon salt, and 1/4 teaspoon pepper to create topping.
Arrange shrimp in 1 layer (slightly overlapping if required) inside a buttered 3-quart flameproof gratin dish or any other wide shallow ceramic baking dish. Cover with herbed breadcrumb mixture, then sprinkle with topping. Bake in upper third of oven until golden, about fifteen minutes. Switch on broiler and broil until crumbs are golden brown, a couple of minutes.
* When salting water to cook, use 1 tablespoon for each 4 quarts water.
**This may also be produced in 8 small baking ramekins for appetizers, or 4 bigger individual baking dishes for primary dish-sized.
***Lastly, I do not recall my mother using a great deal of fresh herbs when creating this herself, especially throughout the winter! So she needed either subbed dried herbs for a number of them, or used italian seasoned breadcrumbs rather. So that's a choice for you personally, too. All I recall maybe it was was PURE Paradise. do we do hope you check it out! Enjoy for me personally. D (Photo from bing images)