Gourmet Night (a.k.a. Gourmet's Paradise) - S1-E5
Corrected entry: When Basil hands the guests the new 'duck-or-nothing' menu, one of the guests says "how extraordinary", then Basil says "Lobster, tournedos, you name it, it's in the bin". Later on, Basil frantically starts preparing salmon mousses and mullet with mustard sauce, dishes that were never specified on the new menu. So how were the guests able to order these if everything from the first menu was scrapped and not listed on the second menu?
Correction: The duck was the main course, the other dishes could quite reasonably be starters or similar. It's extremely common to see menus with a number of fixed dishes and the option to choose the main course.
tw_stuart