From episode 3x09 "The Sinnerman". From episode 3x16 "Infernal Guinea Pig".
Source: The Was And Should Be King — Tumblr
From episode 2x05 "A Hen in the Wolf House".
From episode 3x06 "The Wages of Sin".
Formerly the Rex II Ristorante, Vivian Ward (Julia Roberts) tries to eat escargot.
Peppy has an interview at the restaurant.