we are planning to have chopped liver before dinner of cold salmon. No dairy involved.
Is this permissable?
It is permitted, just wash your mouth out with some liquid and eat something to “wipe ” your mouth out between the two.
Aruch Hashulchan O:CH 173-2, Shevet Halevi 3 pg. 45, Nishmas Shabbos 250-130, PIskei Teshuvos 173 ftnt.7.