Save your vegetable scraps such as carrot tops, trimmings from onions, fennel, parsley and celery, really any vegetable that you like (except the cruciferous family like broccoli, cabbage and brussels sprouts as they can overpower) and place in a large container or plastic bag in your freezer. 

Continue to add vegetable scraps until you have enough to fill a pot.  Then place the frozen veggie scraps into a large stock-pot and cover with water. Bring to a boil, then cover and simmer until the vegetables have softened and have begun to break down. Remove from the heat and keep covered. Cool to room temperature, strain-out and discard (or compost) the solids. You have created a flavorful unsalted broth!  Add salt as needed for your recipes.

And remember, when cooking any meal, do not add salt until the very end.  If added during cooking, much of the salt ends up inside of the food where you won’t taste it.  Salting at the end (or just individually at the table) means that you will add a lot less salt. And whatever you do add, will be able to be tasted and enjoyed!