Step 4: Preparing Mason Jars

Picture of Preparing Mason Jars
 At this point it is a good idea to go ahead and put your mason jars in the dishwasher so they'll be warm by the time your ready to pour in the jam. If you don't have a dishwasher you can heat them in boiling water but it is very important that they be hot when you add the hot jam so the jar does not crack from the temperature difference.