I remember this stuff! It was so cool, and had such a unique texture to it when eaten. Ymmmm... makes me want some, too bad it's off the shelves:
Jell-O 1-2-3 debuted in 1969, offering consumers a new wrinkle in homemade desserts. Jell-O gelatin itself was nothing new by that time; the product had been concocted in 1897. But what made this version of the product different was that once it was mixed with boiling water and set aside to cool, it would separate into three layers: a clear bottom, a chiffon middle and a creamy top.
After a few decades, the novelty may have worn off, and the product was discontinued in 1996 due to declining sales.
To console any remaining disappointed fans, Kraft recently added a recipe to its Web site showing how to make a similar dessert using sugar-free Jell-O and Cool Whip Lite.