Adjust an oven rack so that it is 6 in [15 cm] below the heating element, and preheat the broiler on high. Line a rimmed baking sheet with aluminum foil.
Arrange the beef bones in an even layer on the prepared baking sheet. Broil until the tops are browned, 6 to 8 minutes. Flip the bones with tongs and broil on the second side until well browned, 5 minutes more