Then it hit me. Build the salad in the jar upside down! Build it in layers starting with what you would normally put on your salad last. Why didn't I think of this before? Umm....probably because I wasn't trying to make salads ahead in perfect sized portions before.
You could layer this with anything at all you would normally put in a salad. This one is (starting from the bottom):
Chopped Hard Boiled Egg
Sliced Red Onion
Then I packed as much lettuce in as I could manage. This time it happens to be a combination of iceberg and romaine. I don't do iceberg lettuce often, but while I'm on Atkins I really miss the crunch of things like crackers and croutons. The crunchiness of the iceberg helps a lot with that.
When I'm ready to eat my salad, I'll just dump it into a large bowl and put my dressing on.
I wonder what else I can pre-portion.