Which ingredient is used to make vodka?

The ingredient used to make vodka can indeed be potatoes, as they are one of the traditional sources of starch used in the fermentation process to produce alcohol. Vodka can be distilled from a variety of fermentable materials, including fruits and grains, but potatoes have been a notable choice since they provide a neutral taste profile that is characteristic of many vodka brands.

Other ingredients listed, such as barley, wheat, and corn, are also commonly used to produce vodka. Each of these ingredients has its unique characteristics and qualities that can influence the flavor, texture, and overall profile of the vodka. While it's essential to recognize that vodka can be made from a variety of sources, focusing on the potato provides important insight into one of the traditional foundations of vodka production, emphasizing its versatility and the primary role that starch sources play in the fermentation process.