A microwave beverage and food preparation apparatus that, in one embodiment, converts a common fluid vessel such as a cup, mug, or bowl into a whistling kettle. A user places a lid having an alarm on a vessel containing liquid to be heated in a microwave. A member made of, or containing, nucleation-site-rich material on the underside of the lid extends into the liquid to activate boiling, thereby assuring a safe transition of the liquid to a normal boiling state. Steam escapes through an integrated whistle in the lid, alerting the user to the boiling.