To store: Store unwashed lettuce in a plastic bag in the refrigerator. To store lettuce that you have already washed and dried with a spinner, place back in a plastic bag with a dry paper towel in the bag, and place the package in the vegetable crisper bin. (I like to store my washed lettuce in the salad spinner!)
To prep: Slice the head at its base with a knife and let the leaves fall open. Discard any damaged or leathery outer leaves and tear large leaves into bite-size pieces. Wash leaves in a basin of cold water. Dry in a salad spinner.
To Use: great in salads and sandwiches. One fun option is to take the heart of a magenta lettuce head, cut 2-inches up from the base and then pull the lettuce head in half. Sear on a hot griddle or cast iron pan or BBQ and serve with sprinkled cheese and a vinaigrette drizzle.