Jello 1-2-3!
From Food 52
" The very process of making Jell-O 1-2-3 required a rather careful choreography; you’d need a blender and unusual reserves of patience. You’d set out four dessert glasses, empty the package’s powder into a blender, add boiling water, and blend at the lowest speed for roughly thirty seconds. You’d then ramp it up and blend the mixture at blender’s highest possible speed for a minute, followed by adding a cup of ice-cold water and blending at the same speed for a minute longer.
After the blending was complete, you’d fill each dessert glass half full, one by one, and let each sit for a few seconds. Then, you’d fill the glasses completely in the same order before chilling them for three hours. Who has that time these days? A rather taxing ordeal, to be sure. (The commercial above, from the mid-1980s, gets a lot about this process wrong; the Jell-O 1-2-3 must mature in the confines of a refrigerator, not before the eyes of a young child.)"
