3½ cups (1¾ lbs.) juice
7 cups (3 lbs.) sugar
1 bottle Certo
To prepare juice, grate rind from 4 medium grapefruit, and squeeze out
juice. Add juice to grated rind and let stand for 10 minutes. Press
juice through small cloth. Measure sugar and juice into large saucepan
and mix. Bring to a boil over hottest fire and at once add Certo,
stirring constantly. Then bring to a _full rolling boil_ and boil hard ½
minute. Remove from fire, skim, pour quickly. Paraffin at once. Makes
about 10 glasses (6 fluid ounces each).