Iceberg lettuce should be washed prior to storing. Remove the core by holding the head in your hand and hitting the core area against the countertop. Twist and lift out the core. Rinse the lettuce under cold running water and drain thoroughly core side down in a colander. Wrap lettuce in dry paper towels and place in a resealable bag, removing as much air as possible. Store in the refrigerator. Avoid storing near apples, pears or bananas as they emit ethylene gas which accelerates ripening and will shorten the shelf life of lettuce.