Citrus is not “the sour part.” In a cocktail bar, it is a production input that affects balance, aroma, speed of service, waste, and menu consistency. Two identical specs can taste different simply because the fruit changed. This guide is a practical playbook for bar teams and menu developers. It covers citrus profiles, yield as an operational KPI, storage and freshness discipline, and why perceived acidity can disagree with what a spec seems to “promise.”