Why I cool the jam before I lid the jar

The jam still steams in the pot — and the hand pulls the lid “to shut it now”. Easy: water gathers under the glass, drops fall into the fruit, mould waits on top. I ladle into jars and wait until the heat leaves the surface — only then the lid to a click.

Why I cool the jam before I lid the jar. An opened jar into the cold is about a spoon already started; finishing our own jar is about not collecting a row; cooling soup before the fridge is about a pot on the shelf. Here it is hot jam after the boil: do not trap steam under a lid while the surface still burns the hand.

If I already clicked it hot — I open, wipe the condensation off the lid, and wait again. I don’t bath the jars in ice water. I’m not shopping new sugar from the aisle here — only the jam that already cooks in our pot.

I don’t need a jar with rain under the glass. I need a quiet lid after the cool. In your kitchen before the lid do you cool the jam — or already clamp it “while it is hot”?