The ancient Roman kitchen was known for its innovative and advanced culinary techniques. While they didn't have a built-in slushie machine, they did have a similar device called a 'frigidarium.' This was a room in the Roman baths where they stored snow and ice to keep food and drinks cool. The Romans would use this ice to make refreshing slushie-like drinks by mixing it with fruit juices or wine. These icy treats were enjoyed by the wealthy and elite of Roman society.