Thanks for all your help with the salad! I'll definitely try a papertowel in our bags. I also heard that tearing lettuce from the head is much better than cutting with a knife. It seems like the metal of the knife interacts with the lettuce causing it to turn brown.
As I was digging through the internet, I came across this. It might be a lot of work, but it will help save us from wasting!
Wash and tear up all the lettuce. (We do 5-7 heads of Romaine at a time.)Soak it 30 minutes in ice cold water (I even add some crushed ice before I dunk it.)Drain off all the water and spin dry the lettuce until it is as dry as possible. (We really like the Oxo salad spinner, but any spinner will do.)Put a paper towel in a gallon ziplock bag.Pack in the lettuce.Seal most of the bag, putting a straw into the bag at the very edge.Use the straw to remove as much air from the bag as possible, slipping it out at the last minute as you seal the bag.Store in the fridge.This is a non-chemical way to remove the two things that make lettuce go bad: air and moisture. The lettuce keeps all week, if it was pretty fresh to begin with. I read about this somewhere a year ago, and we've done this ever since. Sounds like a lot of work, but if you process a whole bunch of lettuce each weekend, you're set for the week! You could skip the icewater soak if you were short on time; it still keeps really well. When I take out some lettuce, I usually take out the old paper towel and put a new one in.You don't want to add any wet veggies to your lettuce until you're making the salad, though.
Happy Salad Making!
Here's the link http://www.3fatchicks.com/forum/printthread.php?t=15922.