A popcorn popping device and method in which popcorn is popped in a sealable container at sub-ambient pressure. A vacuum source connected to the sealed chamber of the container reduces the pressure in the chamber prior to the popping process and maintains the reduced pressure throughout the popping process. The vacuum source can be attached to the exterior of the container or positioned remotely. Embodiments of the device include a stove-top version, intended for use with a heating element, a microwave version, or a commercial-style version in which popcorn is popped in a kettle that is positioned within a sealable chamber.