Life on Tap.

esters

esters Compounds responsible for fruits' distinctive flavors, emphasized by yeast in beer. Ester flavors and aromas vary—nearly 100 different beer esters have been identified—but two are common: Ethyl Acetate is quite fruity (think pears, apples and bananas), while Isoamyl Acetate is similar yet with more pronounced banana notes (think weizens).