they have this spray stuff. i believe it can be bought in the grocery stores, but if you spray it on brown wilting lettuce it will do something to the cells... or so ive been told... to make them rigid and hard again so the lettuce retains its shape and regains its color. i know they use it at olive garden. and fast food never has been one of my favorites but i honestly have to say i like subway... but its expensive..and i wouldnt worry too much burgerking is going bankrupt as well as mcdonalds...