At the Brown Derby Restaurant the meat sauce was a specialty of the house according the the 1949 Brown Derby cookbook, Lucy Ricardo ordered her spaghetti and meatballs with extra meat sauce, The set decoration scene looks very like the real Brown Derby. ( see archival photo here ).
In real life Lucille Ball and Desi Arnaz along with many Hollywood stars regularly dined at the Brown Derby. Google image search brings up numerous 1950’s photos that match the decor of the scene. The dinner ware in use in the restaurant was classic Willow Pattern – in the original color photos of the day pink/red willow pattern dishes can be seen.
Original Vintage Brown Derby Ashtray Seen on Etsy – Click to View Details