Heat grill or a heavy duty grill pan on medium-high heat; make sure to heat for at least 2 minutes before placing the steak on the pan. In a small bowl, combine the dry spices; rub spice mixture on each side of steaks. Place steaks on pan, cook for 2 minutes then flip; after flipping add the onions and butter; cook for another 2 minutes. Now add the garlic and cook for 30 seconds. Remove steak from heat and allow to rest for at least 5 minutes before cutting. Serve with warm mashed potatoes or fries.