when you cook something in water for a long time, the water will get that taste
more things you cook more taste you have
and you can save some water aside for later and make something in it
for example rice
it will have all flavours that were used for soup
i recomend it very much but back to soup
I cooked the chicken skeleton(you can use beef bones instead) with some root vegetables(carrot, celery and parsley). I cooked it for 2-3 hours till meat on the bones get soft. At the end you put bones out.
for more soup recipies see Lucia's blog
