Whisk all ingredients together in a bowl. Place steaks in a glass baking dish.
Pour marinade over steaks, turning over to make sure they are fully covered. Marinate in refrigerator for at least two hours, but no more than 24 hours or meat will get mushy.
Remove from refrigerator at least 30 minutes before grilling.
Grill over high heat to start, then lower temperature. Grill until medium-rare (time depends on the thickness of the steak).