Kristi, that's a very interesting way to do the lettuce - I would have thought the hot water would "cook" it!
Here's an article that I found a while back about "how to store salad greens so they last for 2 weeks or more" -- I haven't actually tried it with lettuce and other greens from the garden as of yet, but I store sprouts this way and it has definitely worked for them.
https://www.ruralsprout.com/st...