Dishbeginnerdraft
Jam
Also searched as: jam, strawberry jam, apricot jam, preserves
In short: Jam sets when , sugar and acid come together and enough water has boiled off.
Picture it
Three keys for one lock.
The decisive moments
- 1Mix the fruit with sugar and let it sit
The draws juice out of the fruit.
Osmosis: salt and sugar draw out water - 2Add lemon juice
Acid helps the pectin set and keeps the colour fresh.
Setting with pectin - 3Boil hard until the setting test works
Water evaporates, and sugar and pectin concentrate.
Reducing (reduction) - 4Fill into jars hot
Filled hot and sealed, it keeps longer.
Setting with pectin
Sources · 1
- Harold McGee: On Food and Cooking (2004)