Quick answer
How do I make jam properly?
Cook the fruit with sugar (or setting sugar) until soft and thickened, fill the hot jam into sterilized jars, and turn them upside down. The recipes give ratios and times.
Homemade jam tastes like summer in a jar — and you'll know it on the first spoonful. Find recipes for jams, marmalades, fruit butters, and jellies from strawberries, apricots, plums, and citrus. Simple, not too sweet, and for the whole year.
Quick answer
Cook the fruit with sugar (or setting sugar) until soft and thickened, fill the hot jam into sterilized jars, and turn them upside down. The recipes give ratios and times.
It depends on the fruit and taste — less sugar means fresher flavor but shorter shelf life. Setting sugar or pectin helps.
Boil it again for a few minutes with a little pectin or setting sugar and a squeeze of lemon. Test the set with a drop on a chilled plate.
Officially, marmalade can only be made from citrus — everything else is jam. In your own kitchen it doesn't matter; strawberry "marmalade" is fair game.
Properly preserved and kept cool and dark, it easily lasts a year. Once opened, refrigerate and use within a few weeks.