Jardin des Cygnes

In the short story Yellow Iris, Jardin des Cygnes is a restaurant which is presumably in London run by an Italian restauranteur "fat Luigi". At the beginning of the story, Poirot receives an anonymous phone call to go there because there is danger at a table with yellow irises. When Poirot arrives, he finds that while most of the tables have pink tulips, there is indeed one table with yellow irises. The rest of the plot takes place at the table. How Poirot spots and averts the danger forms the main plot of the story.

Portrayals
In the ITV's 1993 adaptation of the story, there are actually two Jardin des Cygnes restaurants though the filming locations are not known as of now. The first Jardin des Cygnes is in Buenos Aires and part of the story told in flashback. This Jardin is run by Luigi (Luigi de Monico in the adaptation). Poirot actually goes there and is a witness to the first death. Two years later, Luigi has to leave Buenos Aires because of the political upheaval there. He comes to London where he sets up a second Jardin des Cygnes.