In the third, which is known as the _short-boiling method_, the
juice is boiled without the sugar almost the full length of time
required for making the jelly, and the sugar, which has been heated, is
added just before the boiling is completed.
30. Experience in the use of these three methods has shown their
advantages and disadvantages. The first one, or the long-boiling
process, has the disadvantage of losing sugar through the skimming that
is always necessary in the making of jelly. In addition, the long
boiling often causes the sugar to crystallize and thus produces a jelly
that would not score very high. The short boiling is not entirely
satisfactory, because of the difficulty in determining just when to add
the sugar to the juice. The process of mean boiling, having neither of
these drawbacks and usually resulting in jelly of excellent quality, is
the most satisfactory and the one that is recommended.
[Illustration: FIG. 7]
To carry out this method, place the sugar in a pan in a warm oven or
other place where it will gradually become heated without either melting
or scorching. Put the juice over the fire in a saucepan and let it boil
for 5 to 8 minutes.
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