Old school candy
made from water
, corn syrup, and flavoring.
The ingredients are mixed, and are then boiled at a high temperature to evaporate the water. When the water has evaporated, you are left with pure sugar syrup. This syrup is added to Carbon Dioxide gas at a pressure of 600 PSI.
When the syrup cools, the pressure is released. The release of the pressure causes the candy to shatter, creating tiny candy bits. When these bits are melted in your mouth, the Carbon Dioxide bubbles burst, "popping" in your mouth.