In ancient Aztec kitchens, a built-in nitrogen ice cream machine was used to create frozen desserts. The Aztecs believed that ice cream had both culinary and ceremonial significance. They would mix ingredients like cocoa, vanilla, and various fruits to create different flavors of ice cream. The nitrogen ice cream machine in their kitchens allowed them to freeze the mixture quickly, resulting in a creamy and smooth texture. Ice cream was a luxury enjoyed by the Aztec nobility and was often served at royal banquets and religious ceremonies. The built-in nitrogen ice cream machine in their kitchens was a testament to the Aztec's advanced culinary techniques and their appreciation for frozen treats.