Kakigoori

Kakigoori (かき氷) is a shaved ice desert made by churning ice cubes through a crank machine, and then topped with flavored syrup and sweet condensed milk. Popular syrup flavors include green tea, cherry, lemon, grape, and "blue Hawaii." Its texture is meant to be light and fluffy like snow. It's usually served either in a glass dish or paper cup, and can be consumed with a spoon or sipped through a straw.

Historically, kakigoori was enjoyed for centuries among the Japanese aristocracy, but became widely available during the 19th century Meiji period. In modern day Japan, it's a highly popular treat during the hot summer months. Kakigoori are easy to make at home, so crank machines are a common household item. It's also served at special kakigoori stores, convenience stores, restuarants, cafes, and during summertime festivals (see: matsuri).

Additionally, kakigoori has its own national holiday on July 25th, both because that day in 1933 was the hottest day ever recorded in Japan, and the date itself sounds phonetically similar to "summer ice," or natsugoori (夏氷).

During Hiruma’s "Hell Tower" try-outs at Tokyo Tower, Kurita is shown in the observatory making glasses of kakigoori with a crank machine and eating them. He then uses the remaining ice from the ice bags brought to the top as a reward for making the cut.

Given that Hiruma's try-outs were intentionally exhausting and took place on a hot summer day, Kurita's choice in dessert is perfectly appropriate.