5 cups (2½ lbs.) prepared fruit
7½ cups (3¼ lbs.) sugar
½ bottle Certo
To prepare fruit, slip skins from about 3½ pounds fully ripe grapes.
Simmer pulp, covered, 5 minutes. Remove seeds by sieving. Chop or grind
skins and add to pulp. (If wild grapes, Malagas, or other tight-skinned
grapes are used, stem, crush, and simmer with ½ cup water 30 minutes.
Sieve and measure. Use 4½ cups prepared fruit and ¼ cup lemon juice.)
Measure sugar and prepared fruit into large kettle, mix well, and bring
to a _full rolling boil_ over hottest fire. Stir constantly before and
while boiling. Boil hard 1 minute. Remove from fire and stir in Certo.
Stir and skim for 5 minutes. Pour quickly. Paraffin at once. Makes about
12 glasses (6 fluid ounces each).