Anything produced as part of this process which is not ethanol is grouped under the title "congeners", including these highly desired esters. Esters can be found outside of alcohol making too.

Esters are formed by the condensation reaction between an alcohol and a carboxylic acid. This is known as esterification. In a condensation reaction, two molecules join and produce a larger ...

To make an ester, a hydrogen atom must be removed from the hydroxyl group (–OH) of the alcohol. The –OH portion of the acid's carboxyl group must also be removed. The hydrogren atom and the ...