These soups are very delicate, and are much esteemed. They are all made in the same way. The vegetable is boiled until soft, and is then pressed through a sieve. A pint of the vegetable pulp is diluted with a quart of stock (the stock may be veal, beef, or chicken broth). It is thickened with a roux made of one tablespoonful of butter and two tablespoonfuls of flour, seasoned with pepper and salt, and is then strained again, so it will be perfectly smooth. It is replaced on the fire, a cupful or a half cupful of cream added, and the whole beaten with an egg-whip to make it light, and is served at once very hot. The French thicken cream soups with egg-yolks. In this case two yolks would be used for the above quantity. The beaten yolks are diluted with the cream, and cooked only just long enough to set the egg. It would curdle if allowed to boil. Butter is needed for seasoning, and where eggs are used it should be added in small bits before the cream and eggs. Where roux is used for thickening, there is enough butter in the roux.