In formal dining rooms there is often a long table set to the side and the servers use it to stage dishes before they are served to the table. What is that appurtenance called? 
I know a few names for them, but one of them I have no idea how to spell. As has already been mentioned, ‘sideboard’. Also buffet table when you’re looking through furniture listings. I think the name I’m trying to spell is banquette, which looks to be built in seating in America, but was also the name for the narrow walkway around a castle wall.  It’s what I grew up calling it, but I don’t know if I got that from my dad’s side (French Basque/Argentinian married to an Italian-American trained in Russian Ballet) or my mom’s side (Sicilian x4) 