Singapore Sling, definitely.

They ran out of it yesterday upon departure on the NRT-LAX leg of SQ 11 (what is it with pax drinking all the Slings on flights to NRT?). Hopefully SQ had some Sling mix at LAX, lest they'd be out of it for the return voyage as SQ 12 as well. Had the Silver Kris Sling instead, which was quite a bit stronger to the taste, didn't go down as smoothly as the Singapore Sling.

SQ 21/SQ 22 had Slings in Exec Econ five months ago.