genuine article
An authentic thing, as opposed to an imitation.
“Coffee” might be largely sawdust, or wheat, beans, beets, peas, and dandelion seeds, scorched black and ground to resemble the genuine article.
adj
Belonging to, or proceeding from the original stock; native
Not counterfeit, spurious, false, or adulterated
a genuine text; a genuine production; genuine materials; genuine friendship
[…] and before you could say 'scissors' that customer had forgotten all about the genuine article, and was out of the shop with the bijoutry.