If you haven't been building your bitters collection, it's time to start. Bill and Lill Buitenhuys, the couple behind AZ Bitters Lab, explain that chefs have spice racks and bartenders equip themselves with an arsenal of bitters, which act as the seasoning element to finish and round out any cocktail flavor. If you're looking to up the ante for your cocktail recipe relatively inexpensively, bitters are the way to go. From there, it's just a matter of what kind you choose, and they told us everything you need to know about where bitters came from and what kinds are available.