Something About Dr. Mary - S7-E16
Trivia: In this episode, Roz is replaced as Frasier's producer for a short time by a lisping character named Chuck Ranberg. This was the actual name of one of the show's writers and co-producers from 1993-1997 - shows from those years list him in the credits.
Answer: In the last episode, they explained that Tossed Salad and Scrambled Eggs is a metaphor for the mixed-up people to whom Frasier dispenses his radio psychiatric advice.