I like to keep 3 l of broth for a wine reduction as a base for delicious sauces. Take 2 parts (3 l) of broth and 1 part (1.5 l) wine, add some herbs (bay leaves, sage, rosemary, thyme, parsley), some veggies (carrots, onions, garlic, celery) and simmer until reduced to half. Pour the liquid in freezer safe smaller size jars or containers.