This recipe for giblet broth is from Everyday Food, November 2006
In a large saucepan, place neck, giblets, celery, carrots, onions, bay leaf, parsley, 10 cups cold water, and 1/4 teaspoon pepper: Bring to a boil over high heat; simmer 1 hour. Strain broth (if less than 6 cups liquid, add enough water to make 6 cups); discard solids. Set aside. Broth may be made up to a day in advance and refrigerated in a covered container.