Do I need to keep the jars hot when I put the jam in them?
Md Ariful Islam
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Dr. Md Rushad Rahman
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Yes, boil the jars and then when you are ready to can, put them on the counter, put the food inside and then put the lid on. As the jar cools, the lid will suction inward and create a vacuum that keeps your food sealed in and fresh until you open it (up to a year). You should see an indent on the top of the Mason jar if you did it correctly.
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