Lantern Keychain

I'm not aware of a food item named "lantern keychain" that is commonly found in restaurants in the USA. It's possible that you may have misspoken or misunderstood the name of the dish, or that it's a unique item offered by a specific restaurant or region.

Could you please provide more context or details about the food item you're referring to? This will help me better understand your query and provide a more accurate answer. Additionally, if you have any pictures or descriptions of the dish, it would be helpful to include those as well.