Crisper/firmer lettuce can be shredded and stir-fried, braised, or treated like greens.
Slivered lettuce can be used in a non-lettucy cold bean salad. Your idea of lentil salad sounds about right.
Minced and mixed with tabbouleh?
Many lettuces can be used in Cream of Whatever Greens Soup (recipe buried in my LJ; short version is saute chopped onion & garlic, add greens & a small bit of liquid, cover, simmer till well cooked, puree, thin with liquid of choice such as tomato juice or milk or stock, then add a bit of tabasco and other seasonings). Or added to Vichyssoise.
What works depends on what kind of lettuce...
Slivered lettuce can be used in a non-lettucy cold bean salad. Your idea of lentil salad sounds about right.
Minced and mixed with tabbouleh?
Many lettuces can be used in Cream of Whatever Greens Soup (recipe buried in my LJ; short version is saute chopped onion & garlic, add greens & a small bit of liquid, cover, simmer till well cooked, puree, thin with liquid of choice such as tomato juice or milk or stock, then add a bit of tabasco and other seasonings). Or added to Vichyssoise.
Wilted with lots of garlic and slivered almonds.