This should be a deep pot or kettle with a tight-fitting lid. This is important, so that none of the steam may be lost by evaporation. The steam contains the aroma or fine volatile oil and essentials which pass into the air. In a fairly large family little meat need be purchased for the stock pot if the housewife insists that all portions of bone and trimming be sent with the purchased meat. The French women look with horror on the American women leaving all the scrap and trimming to the butcher.