Behold the jigger, the one bar tool to rule them all. You might have seen some super sweet bartender free pour a Zombie with no jigger in sight--but that doesn’t mean he or she was in the right. In fact, chances are your drink wasn’t as good as it could have been were that brazen bartender to have used a jigger.
Correctly measuring out a cocktail is extremely important. Skimp on one ingredient or overpour another and you’ll wind up with an imperfect, inconsistent cocktail. If the recipe calls for an ounce, it means an ounce--not something ounce-ish. The most critical thing to remember when measuring out a spirit is to fill the jigger--really fill it. The jigger should be so full that the liquid forms a convex arc commonly referred to as the meniscus. Master this technique and you’re most of the way to becoming a master drinks maker.