Bring boiling-water canner, half-full with water to a simmer.  Wash jars and screw bands in hot soapy water; rinse with warm water.  Place jars into the canner for 10 minutes to sterilize.  You can put your flat lids in the same water to sterilize them  Drain well before filling.  Be sure to leave l/2″ room at the top of your jar, while fully covering your product.  Wipe the rim of the jar, place the flat lid and tighten the screw band tightly to ensure sealing the product.  Place jars in a water bath for 10-20 minutes.  Take the jars out and put them upright on the counter.  Allow jars to seal (flat lid pops inward) on their own.  If a jar does not seal, simply place it in your refrigerator and eat within 2 weeks.