Coffee tasting

When Starbucks hires a new barista, they have them fill out a "passport", where they make notes on all the different blends of coffee that are sold. Sort of like wine, they're told to write down the different tastes, where it hits your tongue, etc.  Youngest son Jack got a job there right after graduating from high school, but up to that point, had never tasted coffee.

He came home and said, 

"Dad, I don't know what to write down! It all tastes like burnt asshole!"

"Well, you can't write that down. What else does it taste like?"

"They all taste like dirt!"

"Write down 'earthy'".