The hot side was kept hot and the cool side cool. In the days when styrofoam was king, and plastics in waste products were not a concern, McDonald's gave us what could have been the tastiest lettuce and tomato hamburger ever but was kinda just a wasteful version of their quarter pounder.
I used to like the blue of the fish filet foam container.
I will admit iI didn't realize the brilliance of the McD.L.T marketing until today. McD was the first "ingredient!" Lettuce and Tomato are somehow the kickers! I thought there was D in it ala Mc D.L.T but never gave much thought to what that was.
