Root beer
Root beer was a non-alcoholic carbonated beverage that originated on Earth. 

It was one of the items sold at Pops Candy Store in 1893 San Francisco. ()

In 2004,  ordered French fries and a medium root beer at a drive-thru. ()

By the 24th century, it was available across the Federation. On Deep Space 9, root beer was served at Quark's and became a favorite drink of Nog after he was accepted at Starfleet Academy. ()

Quark and Elim Garak both despised root beer, calling it "vile" and considering it a metaphor for the "insidious" pervasiveness of the Federation; Quark remarked to Garak that root beer was "so bubbly and cloying, and happy... just like the Federation", also noting that "if you drink enough of it, you begin to like it – just like the Federation." Quark asserted that Nog's acquired taste for the beverage heralded the end of Ferengi civilization. ()

After traveling back in time to 1947, Quark mentioned root beer to Lieutenant General Denning as an example of his knowledge of Human culture. This was a bluff to cover his lack of knowledge. ()

However, Quark – never blind to the potential for profit – welcomed the acceptance of Bajor's petition for Federation membership in 2373, predicting sales of root beer alone to increase by five. () 

In 2374, while Deep Space 9 was under Dominion control, he even confessed that he wanted the Federation to retake the station so that he could sell root beer again. ()

While Alexander Rozhenko served aboard the  in 2374, crewmate Ch'Targh mockingly suggested that he might prefer root beer (with a lump of ice cream in it) to Klingon bloodwine. ()

Appearances 
 
 
 
 
 
  (Season 3)
  (Season 4)
 
 
  (Season 5)
 
 
  
 
  (Season 6)

External links 
 
 

de:Root Beer
Earth beverages