Green’s Dictionary of Slang

pepper and salt n.2

(US) a severe telling-off.

Bee (Wash., DC) 3 Mar. 3/6: So, Yankee Doodle, keep it up / Give them pepper, salt and thunder.
[US]Lantern (N.O.) 9 July 2: But let me commence my assault on the offending ones and give them pepper and salt.