SORREL.--We gather from the pages of Pliny and Apicius, that sorrel was cultivated by the Romans in order to give it more strength and flavour, and that they also partook of it sometimes stewed with mustard, being seasoned with a little oil and vinegar. At the present day, English cookery is not much indebted to this plant (_Rumex Acetosa_), although the French make use of it to a considerable extent. It is found in most parts of Great Britain, and also on the continent, growing wild in the grass meadows, and, in a few gardens, it is cultivated. The acid of sorrel is very _prononcé_, and is what chemists term a binoxalate of potash; that is, a combination of oxalic acid with potash.
432. Either of the stocks, Nos. 104, 105, or 107, will be found to answer very well for the basis of many gravies, unless these are wanted very rich indeed. By the addition of various store sauces, thickening and flavouring, the stocks here referred to may be converted into very good gravies. It should be borne in mind, however, that the goodness and strength of spices, wines, flavourings, &c., evaporate, and that they lose a great deal of their fragrance, if added to the gravy a long time before they are wanted. If this point is attended to, a saving of one half the quantity of these ingredients will be effected, as, with long boiling, the flavour almost entirely passes away. The shank-bones of mutton, previously well soaked, will be found a great assistance in enriching gravies; a kidney or melt, beef skirt, trimmings of meat, &c. &c., answer very well when only a small quantity is wanted, and, as we have before observed, a good gravy need not necessarily be so very expensive; for economically-prepared dishes are oftentimes found as savoury and wholesome as dearer ones. The cook should also remember that the fragrance of gravies should not be overpowered by too much spice, or any strong essences, and that they should always be warmed in a _bain marie_, after they are flavoured, or else in a jar or jug placed in a saucepan full of boiling water. The remains of roast-meat gravy should always be saved; as, when no meat is at hand, a very nice gravy in haste may be made from it, and when added to hashes, ragoûts, &c., is a great improvement.