Re-grow Romaine Lettuce

I saw something quite similar to this on Pinterest awhile back.  It was with celery  - since I absolutely DESPISE celery, you can understand why I didn't experiment with it instead. 
When we had Uncle Frank over for our first BBQ of the year a couple weeks back, I saved the bottom of the romaine lettuce that I purchased from the store and stuck it in a cup of fresh water on the windowsill above my sink.  I've made sprouts at home before so I know it's really important to rinse and change the water each day. I applied the same concept to the stem by replacing the water and rinsing the base each morning.  Almost right away I saw some growth, but after going away with Heather last weekend I came home to actual baby romaine leaves!  I can't wait to try this with different types of lettuce, and maybe even stick the base in my garden... 
Have you tried this before?  If so what did you re-grow?
xoxo Jax