Gooseberry Jam

6lb Gooseberries, slightly under-ripe, topped and tailed
6lb Sugar
2 pints Water
½oz Butter

Use slightly under ripe gooseberries and remove the tops and tails.
Place all of the fruit into a heavy bottomed saucepan and cover with water.
Bring to the boil and cook, stirring occasionally for 30-35 minutes or until the fruit is tender.
Remove from the heat.
Pulp or mash the fruit.
Add the sugar, stir until fully dissolved.
Add the butter.
Bring to the boil and boil rapidly, stirring frequently, for about 10 minutes.
Test for a set, when the setting point is reached, remove from the heat.
Skim the surface with a slotted spoon.
Pot the jam into sterilised jars.