Abstract: A device for infusing flavor into a fluid, as shown and described in any one or more of the drawing figures and/or any one or more paragraphs of the text. A method of infusing flavor into a fluid, as shown and described in any one or more of the drawing figures and/or any one or more paragraphs of the text. A beverage serving system comprising a cup having a flexible ring integrally formed with an outer wall of the cup; a lid adapted to snugly engage with and cover a top opening of the cup, and having at least one cavity in a top surface of the lid; a flavor infusing device comprising an elongated body having perimeter dimensions that fit into or through the ring.