Abstract: A place-mat/mat having an integrated heating area is used to keep food and beverages warm, making food and beverages more enjoyable to eat or drink, and may also function/be used simultaneously as furniture, such as a place-mat. The integrated heating area employs a phase-change material (PCM). The PCM such as preferably a supersaturated solution of sodium acetate is provided as a reusable heat reservoir and warmer. The place-mat/mat is directly placed under a plate/container in which the food or beverage is served or located.