Set it properly and it keeps for a year
Berry, citrus, stone fruit or savoury
From a fifteen-minute chia jam to a proper marmalade
Getting a set, and keeping it
Chill a saucer, spoon on a little jam, push it with a finger. If it wrinkles, it has set
Apples, citrus and currants are high in it. Strawberries are not — add lemon juice or they stay runny
Oven at 140°C for 15 minutes, and fill them while both jar and jam are hot
Stirring drops the temperature and can crystallise the sugar. Skim the foam at the end instead