So, the lettuce wrap instead of a bun hasn't hit Texas yet, ODB?
Three chains that I know of offer it in California - In-N-Out, Carl's Jr. and Nations. You don't have Carl's Jr in Texas?
As far as putting hamburgers on it, I guess it saves a few calories. Better with chicken breasts to reduce calories. And JJ's seems to have cold cuts so you could reduce fat even further.
Some of us need to watch those calories. Better to ditch the usually tasteless bun and use the calories better elsewere, if at all.
Better to eat on the go than a usually over-lettuced salad ... and salads don't come with catsup and pickles.
There is a hot dog place in the boston area that offers hot dogs on a lettuce roll up.
My boss and I usually have lettuce wraps at least once a week- had them yesterday with rare roast beef, muenster cheese, onions, sun dried tomatoes and wasabi. Delicious!