The McDLT was the McDonald’s burger promoted with packaging that kept its hot and cold ingredients separate.
The product’s name stood for McDonald’s Lettuce and Tomato. Its distinctive container placed the hot patty and bun half on one side and the lettuce, tomato, and other cool ingredients on the other side.
The advertising emphasized assembling the burger immediately before eating. A well-known commercial featured Jason Alexander, who later became widely recognized for playing George Costanza on Seinfeld.
The McDLT is sometimes remembered only as a packaging experiment, but it was also a branded menu item and advertising campaign. Its unusual container created environmental concerns and contributed to the product’s eventual disappearance from the menu.