Cassell's Vegetarian Cookery, page 29 by A. G. Payne
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of eggs. If yolks of eggs are added, beat up the yolks separately and add the soup gradually, very hot, but not quite boiling, otherwise the yolks will curdle.
ASPARAGUS SOUP.--Take a good-sized bundle (about fifty large heads) of asparagus, and after a thorough cleansing throw them into a saucepan of boiling water that has been salted. When the tops become tender, drain off the asparagus and throw it into cold water, as by this means we retain the bright green colour; when cold cut off all the best part of the green into little pieces, about half an inch long, then put the remainder of the asparagus--the stalk part--into a saucepan, with a few green onions and a few sprigs of parsley, with about a quart of stock or water; add a teaspoonful of pounded sugar and a very little grated nutmeg. Let this boil till the stalks become quite tender, then rub the whole through a wire sieve and thicken the soup with a little white roux, and colour it a bright green with some spinach extract. Now add the little pieces cut up, and let the whole simmer gently, and serve fried or toasted bread with the soup.
N.B.--SPINACH EXTRACT.--It is very important in making all green vegetable soups that they should be of a green colour, such as the one above mentioned--green-pea soup, &c., and that we get a good colour, and this is only to be obtained by means of spinach extract. Spinach extract can be made at home, but it will be found to be far more economical to have a small bottle of green vegetable colouring always in the house. These bottles can be obtained from all grocers at the cost of about tenpence or one shilling each. Such a very small quantity goes such a long way that one bottle would probably last a family of six persons twelve months. As we have said, it can be made at home, but the process, though not difficult, is troublesome. It is made as follows:--A quantity of spinach has, after being thoroughly washed, to be pounded in a mortar until it becomes a pulp. This pulp is then placed in a very st