I finally found the taste of Starfleet Academy! Now which related episode should we watch while trying it?

For quite a while I thought "root beer" to be a fictitious beverage, like Romulan Ale or Bloodwine.

Until I stumbled upon some comments by Americans mentioning it to be a real thing!

Only problem was that it is basically unknown and very hard to find here in Germany.After unsuccessfully trying two special US stores as well as a couple of Asia markets (after someone mentioned that it is also a thing in some Asian countries) I basically gave up.

So imagine my excitement when accidentally coming upon this can in my local Edeka market (a type of German higher end grocery store)!

Now I and my kids are ready to try it, but this should naturally be with the right background.

So: Which Star Trek episode that references it should we watch while tasting it?We are currently watching TNG, so this would be preferred (if it even appears in there?).I would even be ok with a Wesley centered episode.. ;-)

Update:

First, thanks to you all for the suggestions! In the end we went with DS9's "Little green men", as other episodes would have required too much contextual knowledge (and are also much darker).

Individually perceived tastes of the Root beer varied somewhere between toothpaste and decomposed rubber.

Final verdict has been mixed:My daughter completely hates it, my wife is not especially fond of it, I kinda like it and my son now has a new favorite soft drink :-)