Ulimate chicken stock recipe from Ina Garten.
Chicken Stock
Ingredients
3 5-pound roasting chickens
3 large yellow onions, unpeeled, quartered
6 carrots, unpeeled, halved
4 celery stalks with leaves, cut in thirds
4 parsnips, unpeeled, cut in half (optional)
20 sprigs fresh parsley
15 sprigs fresh thyme
20 sprigs fresh dill
1 head garlic, unpeeled, cut in half crosswise
2 tablespoons kosher salt
2 teaspoons whole black peppercorns
Directions
Place the chickens, onions, carrots, celery, parsnips, parsley, thyme, dill, garlic, and seasonings in a 16- to 20-quart stockpot. Add 7 quarts of water and bring to a boil. Simmer uncovered for 4 hours. Strain the entire contents of the pot through a colander and discard the solids. Chill the stock overnight. The next day, remove the surface fat. Use immediately or pack in containers and freeze for up to 3 months.
http://www.foodnetwork.com/recipes/ina-garten/chicken-stock-recipe2/index.html
I wouldn't discard *all* of the solids. The chicken meat will have lost it's flavor to the broth, but will make great cat or dog food. The veggies should be flavorful, I'd eat them. Maybe let them drain and dry a bit, then slice and sautee or roast in some butter or olive oil. Or mash the carrots and parsnips with a bit of cream and serve with butter, salt, and pepper.