In a small bowl, whisk the pomegranate molasses, olive oil, mustard, brown sugar, garlic powder, and grated garlic.
Pour the marinade in a gallon ziploc bag. Add the steak.
Pushing out as much air as possible, close the bag and refrigerate the meat for at least 6 hours and up to 24 hours (use the longer marinade time if using flank steak or hanger steak).
Notes
This marinade works especially well with ribeye, New York strip, sirloin, flank steak, and hanger steak.
Marinate for at least 6 hours for the best flavor.
Discard any marinade that has come into contact with raw meat.
Storage: Whisk the marinade together and store it in an airtight container in the refrigerator for up to 3 days before using.