Fennel is an herb with a distinct anise-like flavor that can add a unique twist to cocktails. Both the bulb and seeds of fennel are used in mixology, providing a subtle licorice taste that pairs well with a range of spirits. Fennel-infused syrups or bitters can be found in cocktails like Fennel Martinis, Fennel Gin and Tonics, and other herbaceous drinks. Its slightly sweet and aromatic qualities make fennel a sophisticated addition to complex and innovative cocktails.