The first of five clues. Each one below gives a little more away.
Salt is the secret, and none of it ends up in me.
I was a luxury of emperors long before I was something children queue for.
Roughly half of me is air, whipped in deliberately.
The cone caught on at a world's fair when a stall ran out of dishes.
Cold, sweet, and handed over in a cone.
Ice Cream
Salt lowers the freezing point of the ice packed around the churn, letting the mixture fall below zero. That is why the salt goes on the outside and never into the recipe.
Chilled desserts are ancient, but freezing one on demand required a trick discovered in sixteenth-century Italy: adding salt to ice makes the ice melt, and melting absorbs heat, dropping the brine well below zero. Surround a churn of cream with that and it freezes while being stirred, which is the whole method. The stirring matters as much as the cold, because it beats in air — roughly half the volume of cheap ice cream is air — and keeps the crystals small. Cheap versions are mostly air and taste icy; dense ones melt slowly and taste rich.
Reading five clues at once is not the game. In the real thing they arrive one at a time and every wrong guess costs an hour. Play mystery #44 · today's mystery · the vault
Previous: mystery #43. Next: mystery #45. Or try #39, #40, #41, #42, #43, #45.