How do you cut lettuce so the ends will not turn brown?

To prevent lettuce from browning after cutting, use a sharp knife to make clean cuts instead of tearing or using a dull knife. Additionally, you can soak the cut edges in cold water or immediately place the lettuce in a bowl of ice water to minimize exposure to air. Applying a small amount of lemon juice or vinegar on the cut edges can also help slow down the browning process. Finally, store the cut lettuce in an airtight container in the refrigerator to keep it fresh longer.