According to the lyrics of the Christmas classic "The Christmas Song" (also known as "Chestnuts Roasting on an Open Fire"), chestnuts are "roasting on an open fire." The song describes the warm and cozy feeling of the holiday season and emphasizes the tradition of roasting chestnuts over an open fire. The fragrance and crackling sound of the roasted chestnuts evoke feelings of comfort and joy, making them a beloved symbol of the holiday season.