Thaw hanger steaks and pat dry on all sides with paper towel. Liberally season with salt and pepper on all sides and allow to sit in refrigerator uncovered for 30 minutes.
Place steaks in a zip top plastic bag and pour marinade over steaks. Remove all air from bag, zip closed, and place in refrigerator.
Marinate steaks for 8 to 12 hours in refrigerator, flipping bag halfway through marination time.
After marinating steaks, remove from bag and allow to come to room temperature, about 30 minutes.
When steaks are marinated, preheat grill to 500 degrees F using direct heat. Clean and oil grill grates.
Grill steaks 5 minutes on one side, flip steaks and continue to grill for another 4 minutes. Remove from grill for medium-rare doneness. (To cook to a higher desired temperature, refer to Omaha Steaks grilling chart.)
Allow steaks to rest for 8 minutes, then slice on the bias.
Serve with grilled sweet potato wedges and pistachio pesto.