STEP 1/6
First of all, I have to disinfect the jam bottles, but I made them all of a sudden, so I recycled the jam bottles that I had collected before. If you put a glass bottle in boiling water, the bottle may crack, so you can put it in from the beginning and boil it.
STEP 6/6
Boil it until it's halved! Stir once in a while so that it doesn't stick. When it boils, add lemon juice and finish! They say they'll put in handmade jam to keep it for a longer time. If you don't have it, it's okay not to.