Core iceberg lettuce by cutting the base out with a sharp knife. You can loosen the core by rapping the head sharply, core down, on the kitchen counter, then pulling it out. Rinse under cold water and use a salad spinner or pat the leaves dry to remove excessive water. Cut into wedges, chop, or tear into bite-sized portions for salads. Chopped lettuce can be refrigerated in a sealed plastic bag for up to 1 week.
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