Various herbs and vegetables are required for the purpose of making soups and gravies. Of these the principal are, Scotch barley, pearl barley, wheat flour, oatmeal, bread-rasping, Pease, beans, rice, vermicelli, macaroni, isinglass, potato-mucilage, mushroom or mushroom ketchup, champignons, parsnips, carrots, beetroot, turnips, garlic, shallots and onions. Sliced onions, fried with butter and flour till they are browned, and then rubbed through a sieve, are excellent to heighten the color and flavor of brown soups and sauces, and form the basis of many of the fine relishes furnished by the cook.
The older and drier the onion, the stronger will be its flavor. Leeks, cucumber, or burnet vinegar; celery or celery-seed pounded. The latter, though equally strong, does not impart the delicate sweetness of the fresh vegetable; and when used as a substitute, its flavor should be corrected by the addition of a bit of sugar. Cress-seed, parsley, common thyme, lemon thyme, orange thyme, knotted marjoram, sage, mint, winter savory, and basil, as fresh green basil is seldom to be procured, and its fine flavor is soon lost, the best way of preserving the extract is by pouring wine on the fresh leaves.
For the seasoning of soups, bay-leaves, tomato, tarragon, chervil, burnet, allspice, cinnamon, ginger, nutmeg, clove, mace, black and white pepper, essence of anchovy, lemon-peel, and juice, and Seville orange-juice, are all taken.