found a nice-sounding pea,lettuce,asparagus soup recipe. You fry onion, garlic, add chopped asparagus, then add your stock )I assume chicken or veg), then lettuce and frozen peas. Sounds rather nice. Oh, may have had bacon in it also
Apparently you can make soup out of iceberg lettuce but I've never tried it.
I have used a type of butter lettuce in stir fry dishes but I'm not sure that would work with iceberg. The lettuce I use has a heavier texture than iceberg