First, get your mason jars sterilized and ready to go. Fill a large pot with the jars and cover them fully with water, making sure the water is at least 1 inch above the top of the jars. Bring the water to a boil, then continue to boil for at least 10 minutes. After that, you can turn off the burner and let them sit in the hot water for up to an hour. You can also put the lids and rings in the water at this point, since boiling them could damage the seals.