Here's a guide in helping you store a lettuce properly and prolong its freshness. Place a paper towel on top of the lettuce and beat the stem portion with a hammer. Remove the stem of the lettuce by prying it out with your hands. Tear the lettuce into two sections or into small ones. Put all of it inside a zip lock bag and then place it inside a refrigerator. Take them out when the lettuce is needed for cooking. With these easy to do tips, you are now ready to cook those well preserved lettuce onto your tasty dish.