In an effort to try something new, I stuck a romaine lettuce stub in a cup of water.
This is it after 3 days:
And this is it after a week of growing:
All you have to remember to do is change out the water daily, and you'll have another crop of new lettuce in a couple of weeks. And as if we don't already have a variety of loose leaf lettuces growing in our garden, I have 3 of these growing in our kitchen, each a couple of days behind the other!
Other vegetables you can try growing this way include celery, green onions, and lemongrass.