How to Sterilize Jars and Lids for Winter, Jams, Ajvars, etc. Winter is the one that lasts — juices, jams, compotes, but also ajvar should be preserved — without mold until everything is eaten. Every real housewife knows that it is important to sterilize jars for the winter, if it is not done properly, the whole process of making jams and ajvar can go to waste. Every real housewife knows that it is significant to sterilize jars for the winter, if it is not done properly, the