Don't throw out the base of your next fresh romaine - regrow it.
Remarkable as it may seem, according to Don't Waste the Crumbs, romaine lettuce is just one of 10 Foods That Regrow in Water. What's more? It's super easy! Just place it in a small bowl or a cup, with about an inch of water, and place it on a window sill. change the water daily. you'll see new growth in a few days, and produce half a head of lettuce in a couple of weeks. Voila, Free Food!