Adding carbon dioxide, decreasing oxygen. Bottling. Canning. Cooking in sugar, and storing. Curing. Drying. Freezing. Irradiating. Jellying. Pickling. Potting, and sealing with fat. Preserving in alcohol or syrup. Refrigerating. Salting. Smoking. Stewing, and jugging in brine or gravy. Vaccum-packing.