Start with soup or neck bones. Wipe them with a clean, damp cloth and put them in a roasting pan. Cut an onion or two in quarters and scatter over the bones. Cut two carrots and two stalks of celery into 3-4 pieces each and scatter those as well. Place your roasting pan in a 400 degree oven until the bones are nicely browned.
Place the bones in a stock pot, along with the onions, carrots, and celery. Cover with cold water. Add a few peppercorns, a spring or two of parsley, a bay leaf, and 2-3 whole cloves. Set stock pot on medium heat and bring to a simmer. Cover with lid at an angle so a little steam escapes and lower heat so that stock just barely simmers beneath the surface. A rolling boil here is exactly what you DON'T want. It produces a bitter, cloudy broth. A gentle simmer will give you clear, flavorful broth. Let it simmer for at least 4 hours--6-8 is even better. When the meat is completely falling off the bone and has had every last smidgen of flavor cooked out of it, your stock is done. (Resist the temptation to do something with the meat--you'll just waste whatever ingredients you put with it because it is absolutely tasteless.)
Let the stock cool briefly and then strain it into a container that you can refrigerate. (You can save a few of the bones for your pet, but again, they don't have much flavor.) Let it cool 30 minutes or so and then refrigerate for several hours or overnight. The fat will rise to the top and harden, making it very easy to remove.
If you want to use this as a clear broth, strain it again through several layers of rinsed cheesecloth. It will lose a little bit of its flavor so only do this if it is absolutely necessary.
I often take the finished broth and freeze it in smaller containers to pull out and add to soups or gravies. But give it a starring role in French Onion Soup at least once, so you can really appreciate the difference!
NOTE: I never add salt when making broth. Since I don't know for sure what I will be doing with it, i.e., will I be using it in a sauce that is significantly reduced, it's best to salt it in the final stages of whatever it ends up in.
