Any single food containing all the elements necessary to supply the
requirements of the body is called a complete or typical food. Milk
and eggs are frequently so called, because they sustain the young
animals of their kind during a period of rapid growth. Nevertheless,
neither of these foods forms a perfect diet for the human adult. Both
are highly nutritious, but incomplete.
Served with bread or rice, they form an admirable meal and one that is
nutritious and easily digested. The white of eggs, almost pure
albumin, is nutritious, and, when cooked in water at 170 degrees
Fahrenheit, requires less time for perfect digestion than a raw egg.
The white of a hard-boiled egg is tough and quite insoluble. The yolk,
however, if the boiling has been done carefully for twenty minutes, is
mealy and easily digested. Fried eggs, no matter what fat is used, are
hard, tough and insoluble. The yolk of an egg cooks at a lower
temperature than the white, and for this reason an egg should not be
boiled unless the yolk alone is to be used.
Ten eggs are supposed to weigh a pound, and, unless they are unusually
large or small, this is quite correct.
Eggs contain from 72 to 84 per cent. of water, about 12 to 14 per
cent. of albuminoids. The yolk is quite rich in fat; the white
deficient. They also contain mineral matter and extractives.
To ascertain the freshness of an egg without breaking it, hold your
hand around the egg toward a bright light or the sun and look through
it. If the yolk appears quite round and the white clear, it is fresh.
Or, if you put it in a bucket of water and it falls on its side, it is
fresh. If it sort of topples in the water, standing on its end, it is
fairly fresh, but, if it floats, beware of it. The shell of a fresh
egg looks dull and porous. As it begins to age, the shell takes on a
shiny appearance. If an egg is kept any length of time, a portion of
its water evaporates, which leaves a space in the shell, and the egg
will "rattle." An egg that rattles may be perfectly good, and still
not absolutely fresh.
TO PRESERVE EGGS
To preserve eggs it is only necessary to close the pores of the
shells. This may be done by dipping them in melted paraffine, or
packing them in salt, small ends down; or pack them in a keg and cover
them with brine; or pack them in a keg, small ends down and cover them
with lime water; this not only protects them from the air, but acts as
a germicide.
Eggs should not be packed for winter use later than the middle of May
or earlier than the first of April. Where large quantities of the
yolks are used, the whites may be evaporated and kept in glass bottles
or jars. Spread them out on a stoneware or granite plate and allow
them to evaporate at the mouth of a cool oven. When the mixture is
perfectly dry, put it away. This powder is capable of taking up the
same amount of water that has been evaporated from it, and may then be
used the same as fresh whites.
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