about one hour Click to see full answer. Likewise, people ask, how do I make my lettuce crisp?Place the lettuce into the bowl with the ice cubes. Add enough cold water to the bowl to completely cover the lettuce. Let the lettuce sit in the ice and water mixture for approximately 15 minutes in order to crisp up the lettuce. Remove the lettuce from the bowl and dry it using a salad spinner or paper towels.Beside above, why does putting lettuce in water make it crispy? Osmosis in the kitchen. Lettuce should be fresh and crisp but upon storage water will eventually evaporate. The pressure inside the cells drops and the leaves shrink and become less appetizing. The water will then diffuse back into the cells again. Also question is, how do you keep lettuce crisp in the fridge? Keep Lettuce Fresh Longer Wash your lettuce, and remove any damaged leaves. Dry your lettuce thoroughly. Wrap the lettuce in a dry paper towel and place it in a plastic bag or storage container. To maintain the proper temperature and moisture level, store your lettuce in the crisper drawer in your fridge. How do you keep lettuce crisp after washing?After washing your lettuce leaves, spin them dry and place the slightly damp greens in a container. A container is best, but you can use a plastic bag if you keep a corner open (to allow some airflow in). Add a few paper towels to absorb excess moisture and you’ll be able to store these greens for seven to 10 days.