This high flavor-intensity dish requires a high intensity wine. If the wine has too little intensity, the flavor of the wine will be lost and you will miss the opportunity to enjoy the interplay of the two flavors.
Because of the mouth-filling flavor of grilled steak, the right wine needs to be medium in tannin to give the wine a taste impression that is big enough to match the substantial mouth presence of this dish.
The dominant flavors of this dish are dark so the wine that complements it needs fruit flavors that are in the dark fruit family. Other dark flavors in the wine bring an interesting complexity to the overall taste experience.