Pappardelle with Seafood in Pink Peppercorn Sauce

Name: Pappardelle with Seafood in Pink Peppercorn Sauce
Ingredients: 1/2 stick butter, divided; 1/2 cup chopped leeks, white and light green parts only; 1 largish shallot, chopped; 2 cups lobster stock, or any seafood stock; 1 cup dry vermouth; 1 cup heavy cream; 1/2 tablespoon pink peppercorns; 3 pinches cayenne pepper; 1 pinch salt (depending on saltiness of stock); 1/2 pound shrimp, peeled, deveined and tails off; 1/2 pound squid, bodies only, cut into 1/2 rings; 1/3 pound bay scallops; 1 1/3 pounds fresh pappardelle; 1/3 cup chopped parsley