This material is known as
_extractives_, and it contains in its composition stimulating
substances. On the other hand, plunging the meat into hot water and
subjecting it quickly to a high temperature will coagulate the protein
in the tissue and prevent the extractives from leaving the tubes.
24. To obtain the most flavor from meat that is properly prepared, it
should be put over a slow fire and allowed to come gradually to the
boiling point. As the water approaches the boiling point, a scum
consisting of coagulated albumin, blood, and foreign material will begin
to rise to the top, but this should be skimmed off at once and the
process of skimming continued until no scum remains. When the water
begins to boil rapidly, either the fire should be lowered or the kettle
should be removed to a cooler part of the stove so that the water will
bubble only enough for a very slight motion to be observed. Throughout
the cooking, the meat should not be allowed to boil violently nor to
cease bubbling entirely.
The meat should be allowed to cook for at least 4 hours, but longer if
possible. If, during this long cooking, too much water evaporates, more
should be added to dilute the stock. The salt that is required for
seasoning may be added just a few minutes before the stock is removed
from the kettle. However, it is better to add the salt, together with
the other seasonings, after the stock has been drawn off, for salt, like
heat, has a tendency to harden the tissues of meat and to prevent the
flavor from being readily extracted.
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