No! Not that kind of salt.

That's not a bad roll, actually...

not enough black keys to be salty

Three SRs. The recipe calls for salt, not sugar, Gudako.

Getting a Martha and Herc isn't salty

No SSRs among them, though, as far as I could see. That might be why she considers it "salt".

Going from setz's tumblr post, this one turns out to be a commission, so it could be that he didn't know much about FGO and just took whatever screenshot available for him to use for the strip. Setz is a he, right?

It's salt if it isn't your waifu the character you were rolling for.