First, ready the jars, lids, and screw bands. Jars, whether new or previously used, should be free of chips and scratches. New lids must be used for each batch, though screw bands, if in good condition, can be reused. Wash the jars, lids, and bands well in hot soapy water, either by hand or in a dishwasher. Place the lids in a small saucepan with water to cover, bring to a simmer (180°F/82°C), and maintain the simmer until you are ready to use them. Avoid boiling the lids, or you may compromise the seal.