Thickenings for Soup.
I have before recommended the making of soup the day before it is served, as this is the best means of having it entirely free from fat and settlings. Just before it is served, it may be thickened with corn starch, sago, tapioca, pearl barley, rice, etc. If a thickening of flour is used, let it be a roux, mixed according to directions, page 51. However, a rich stock jelly needs no thickening.