How to create carbonated, instant soft serve using dry ice
Forget waiting hours for an ice cream maker to churn. By using the rapid sublimation of dry ice, you can transform a simple dairy base into a fizzy, aerated soft serve in minutes. It is a high-speed culinary technique that turns liquid into frozen, bubbly dessert almost instantly.
The process relies on the unique properties of dry ice, which sublimates directly from a solid into carbon dioxide gas at room temperature. To achieve the desired texture, you first prepare a base by mixing ingredients by volume—typically four parts cream, two parts milk, and one to two parts granulated sugar, along with flavorings like vanilla or cocoa. The key is to introduce dry ice in a fine powder form, which can be created using a food processor.
As you stir the powder into the base, the mixture will vigorously bubble and expand. This is the dry ice 'boiling' as it turns to gas, a process that simultaneously freezes the dairy and incorporates air bubbles to create a light, carbonated texture. Because the dry ice is constantly shrinking as it turns to gas, you should use approximately one part dry ice for every four parts of your ice cream base, though it is wise to purchase more than necessary.
Safety is paramount when working with such extreme temperatures. Dry ice can cause frostbite upon skin contact, so avoid touching it directly. Furthermore, because it releases carbon dioxide, you must work in a well-ventilated area to prevent the gas from displacing oxygen. It is also critical to ensure all large chunks are pulverized; any remaining solid pieces could cause burns to the inside of the mouth. Once the soft serve texture is reached, the dessert can be eaten immediately or frozen overnight for a harder consistency, though letting it sit briefly allows any remaining gas to sublimate.
Source: Instant, carbonated ice cream made with dry ice
