Use only fresh garlic cloves. The pre-minced garlic turns very bitter. Cook garlic in oil in a small non-stick frying pan over low heat until tender, about 5 minutes.
Add onions, increase het to medium-low and continue cooking until onions are crisp-tender, about 5 minutes.
Stir in salt and pepper. Remove from heat; let cool.
Trim excess fat from steak. Make a horizontal cut through the center of the steak parallel to the surface of the meat,
about 1" from each side to form a pocket. Cut up to but not through the opposite side. Spoon cooled garlic mixture into pocket,
spreading evenly. Secure opening with toothpicks.
To Freeze: Place steaks in a freezer bag or freezer safe container.
To Reheat: Defrost. Grill steaks over medium-low heat. Cover grill for 26 to 32 minutes or to desired doneness, turning once. Be sure to follow these instructions in order to
cook the garlic.