Amatara

For mithen:

( Five times Spock tried Earth cuisine. All TOS, though one can be read as Reboot too, as strikes your fancy. )

Oh, hard, hard. Because this is the ur-slash-shipping fandom, and there aren't that many het pairings in there.
I'm going to include the TOS movieverse too, if you don't mind, just to make it a little easier on myself.

+ OTP:  Spock/Saavik, how they were presented in the novels. Not in a "predestined" or "I couldn't see Spock with anyone else" OTP kind of way, but they are a gorgeous couple: rational enough to still be Vulcan, yet with that base of respect and yes, love. And I adore how Saavik can match Spock in anything: wit, intelligence, and sheer strength of character. Also, platonic Kirk/Spock/McCoy: because those scenes where one of the three is either dead or dying, and the other two grieve or care for him just make me swoon. And in a somewhat different category: Kirk/Enterprise. Because this man really does love his lady. :)
+ Runner-up:  Sarek/Amanda; Spock/that female Romulan captain from "The Enterprise Incident" he seduces in order to get to her cloaking device (if that doesn't suggest a double meaning, I don't know what does *g*) because the UST was just dripping of the screen. Yep, I do have it in for the Vulcanoids. Also Kirk/Edith Keeler from "City of the Edge of Forever" since it's Kirk's only romance from the three-year run that made a lasting impression on me and felt as if it could've been something profound.
+ Honorable mention(s): Kirk/Janice Rand. Didn't always like how it was handled, but a nice bit of continuity and they really had their moments of being hot together.
+ Crack pairing(s): Scotty/Uhura. Because, no matter how much I disliked Star Trek V, the idea of these two having a thing for each other simply melted my heart into a puddle, and made an odd kind of sense too.   
+ Ship everyone else seems to like, but I don't: Non-platonic Kirk/Spock/McCoy in any combination. Because the sex doesn't push my buttons in this case, but also because I need all three for the dynamic to be complete, and slashing them would involve moving one of them to the sideline. Unless you'd go for the entire threesome, but non-platonic threesomes are generally a bit too kinky for my tastes. *g*