Black Angus, also known as Aberdeen Angus, is a breed of black cattle prized for its excellent flavor and marbling. Flat iron steak is a cut of beef that has gained popularity for its tenderness and rich flavor. It is obtained from the shoulder area of the animal, specifically from the top blade roast. The name "flat iron" comes from the shape of the steak, which resembles an old-fashioned flat iron used for ironing clothes.