I am sorry, Mount Trenchard, but I beg to differ. If it says 'soupe' in the menu, it is not a pumpkin sauce, it is definitely a small soup that is served. No later than yesterday, in the restaurant where I had dinner, there was a very tiny bowl of soup that accompanied the meat. It seems to be a new trend in cuisine.I think it might be Roasted scallops in a pumpkin sauce with blue cheese.
This is because we all assumed it was a typo. You are right indeed, 'souple' as a noun does not exist, and the adjective 'souple' in this context would not make sense.I can't find any translation, or even definition, for "souple" used as a noun. (As an adjective it means "supple", "flexible", "lithe", etc. Nothing to do with soup or sauce.)