Broiled Shrimp with Garlic Butter

Name: Broiled Shrimp with Garlic Butter
Ingredients: 6 tablespoons unsalted butter, at room temperature; 1 teaspoon finely chopped garlic; 1 tablespoon chopped shallots; 1 tablespoon chopped fresh Italian parsley; 1/2 lemon, juiced; Fine sea salt, to taste; 24 uncooked large shrimp, shell and tail on; 1/2 cup Fish Fumet, recipe follows, or water; 2 pounds heads and bones from black bass, red snapper or halibut; Cold water; 2 tablespoons corn oil; 1 medium onion, peeled and very thinly sliced; 1/4 small fennel bulb, very thinly sliced; 1 leek, very thinly sliced; 15 white peppercorns; 1/4 teaspoon fine sea salt; 1 sprig fresh Italian parsley; 1 bay leaf; 1 cup dry white wine; 3 cups water