Sourdough Roll Baked on Top of Onion Soup Ramekin

"Sourdough Bake on Top of Onion Soup Ramekin"

A long, long, time ago while residing in Lyon, I remember a small bistro that served a particularly luscious Onion Soup concisting of a Sourdough Roll on top of grated Gruyere Cheese followed by an extremely tasty Onion Soup. The sourdough roll was finished by placing the proofed rolls on top of the grated cheese that topped the hot onion soup in an over sized ramekin soup dish - it was then finished in the oven.

I've been  searching the internet attempting to find mention of this and so far haven't come up with a thing? I would appreciate any help people of the freshloaf can provide...,

Best regards to All,

Wild-Yeast