Our premium natural black olives are typically prepared by harvesting the olives , rinsing , sorting and calibrating them based on size and quality , curing them in brine or fermenting them to reduce bitterness , then . Oxidized if needed . prepared sliced , pitted or whole as needed , then packed into cans or jars along with brine , oil or any desired seasoning , sealed and pasteurized or serialized to ensure preservation . Quality control is crucial throughout to process to maintain taste , texture , and safety standards. Available package : plastic drums , metallic tins , glass jars , pet jars .