Created as a special request of a woman who was looking to impress her guests. Legend has it they were first served at the little Casino in Narragansett Rhode Island. Do I have your Attention? History of Clams CasinoĬlams Casino first showed up on menus in the early 1900’s in the Northeastern United States. Jumbo Keto Clams Casino are made with fresh cherrystone clams and loaded with bacon, butter and cheese.