Mustard in cocktails is quite unconventional but can be used to add a surprising depth of flavor and a bit of heat to drinks. This ingredient is typically utilized in the form of mustard seeds or mustard oil rather than the more common prepared mustard. Mustard seeds can be infused into spirits, creating a unique base for cocktails that desire a spicy, aromatic kick. For instance, mustard-infused vodka or gin can be used in bloody marys or martinis to add an earthy, spicy twist.

Additionally, mustard oil might be used in small quantities to add a pungent aroma to a cocktail, enhancing the complexity of the drink's flavor profile. This technique is particularly appealing in savory cocktails or those that lean towards herbal and vegetable ingredients, where mustard’s sharpness can be a balancing element.