Bison heart has a stronger flavor than regular muscle meat, but it is also a muscle, like a regular steak cut, and just like any steak that is cooked right, it can be tender and juicy.
Bison heart is sold sliced. This is not actually an organ, but fits well into this category. It is pure muscle, just like steak, but it has a stronger flavor. Bison heart contains all essential amino acids, zinc, selenium and phosphorus.