A T-bone steak is a cut of beef from the short loin that features a "T"-shaped bone with two different muscles: the strip loin and the smaller tenderloin (filet mignon). It's considered a high-quality steak because it combines the flavors of the strip and the tenderness of the tenderloin in one cut. T-bone steaks are versatile and can be cooked on a grill, on the stove top, or in the oven.