Remove blossom and stem ends from gooseberries. Force berries through food mill.
Measure 4 tea cups of the berry mash into a large pot. Stir in the sugar. Bring to a full rolling boil over high heat, and boil hard for 1 minute, stirring constantly. Remove from heat, and stir in pectin at once. Skim off any foam with a large metal spoon.
Sterilise jars and lids in boiling water for at least 10 minutes. Take turns with skimming foam, and stirring the berry mixture for 5 minutes to let it cool slightly. Ladle into hot sterile jars, leaving 6mm headspace.
Process in a boiling water bath for 10 minutes. Remove and seal jars.