Culinary uses for bolted lettuce? Does anyone have a culinary use for a lettuce which has bolted? Or do I throw it away?

Bolting being what gardeners call that moment when your lovely full bodied lettuce suddenly shoots skywards, in order to produce seed. Once salad crops have bolted the leaves still have a good colour, but they are usually thought of as unusably bitter.
While it might be too tough and bitter to eat as a raw salad, you might try it as a warm wilted lettuce salad with a sweet and sour dressing (bacon, bacon grease, onions, cider vinegar, sugar) to help mask bitterness.

Alternatively you might also try a Lettuce and Pea Soup:
Sweat onions in butter, season with salt and pepper.  Add lettuce and wilt down.  Add fresh or frozen green peas along with chicken stock and bring to a simmer until peas are soft and tender.  Puree (maybe add a little chopped fresh mint) and adjust seasoning with additional salt, pepper, and sugar if the peas don't produce enough sweetness.