What is "buona"

Buona (sometimes referred to as Buona Beef) is an American restaurant chain that specializes in Italian beef, along with other dishes such as pizzas, and Chicago-style hot dogs. The company was founded in 1981 by Joe and Peggy Buonavolanto. Since its opening, the company has launched a total of 17 restaurants and 2 catering facilities in the Illinois area. The company is still run by three generations of the Buonavolanto family.