When it is in the presence of acid and
combined with the correct proportion of sugar and the combination is
properly boiled, a desirable jelly is the result. Without pectin,
however, it is impossible to make the juice solidify, or jell. Pectin is
closely related to the carbohydrates, but as it does not yield heat
energy nor build tissue, its food value is not considered. In this
respect, it is like the cellulose of fruits and vegetables.
It is because green fruits contain more pectin than do ripe fruits that
they are more suitable for jelly making. The lack of either acid or
pectin need not, however, prevent the making of jelly from fruits, such
as sweet fruits, that contain other jelly-making properties, for either
or both may be supplied from some other source. In other words, jelly
may be made from any fruit that will yield juice and flavor.
EQUIPMENT FOR JELLY MAKING
[Illustration: FIG. 1]
12. NECESSARY EQUIPMENT.--In the making of jelly, as in the preparation
of many other foods, numerous utensils will be found convenient and may,
if desired, be supplied to make the work easier. However, the necessary
ones are comparatively few in number and, for the most part, are found
in almost every kitchen.
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