By 400 BC, Persian engineers had mastered the technique of storing ice in the middle of summer in the desert.
Wow. That was just around the time of the Peloponnesian War.
These ancient refrigerators were used primarily to store ice for use in the summer, as well as for food storage, in the hot, dry desert climate of Iran. The ice was also used to chill treats for royalty during hot summer days and to make faloodeh, the traditional Persian frozen dessert.
If I remember correctly, that falooda had rose syrup, vermicelli, milk, vanilla ice cream and pistachio. I consider it the Greatest Dessert Ever.