It Takes Two to Tangle - S8-E17
Trivia: In the opening credits Niles mentions that Daphne had lost 9 lbs. 12 oz at the weight-loss spa. This is a deliberate reference to the birth of Janes Leeves' (Daphne) daughter. According to www.imdb.com, she was born in Jan 2001 and weighed 9 lbs. 12 oz.
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.