With which spirit is mustard made?

Mustard is primarily made using vinegar, water, and mustard seeds. While various spirits can be used to create unique flavored mustards, the best choice in the context provided is Featherbone Bourbon. This bourbon can complement and enhance the flavor profile of mustard due to its distinct whiskey characteristics.

Using bourbon as a base for mustard can add depth, sweetness, and complexity, making it a preferred option for specialty or gourmet mustards. Other spirits, such as vodka or rum, might not provide the same robust flavor that bourbon offers, which is why Bourbon stands out as the ideal pairing for mustard production.