Grilled Flank Steak Pinwheels

2 1-1 1/2 lbs. flank steaks
2 cup onions, chopped
4 tbs. garlic flakes
1 cup oil
2/3 cup vinegar
2 tsp. salt
1/2 tsp. thyme
1/2 tsp. marjoram
1/8 tsp. red pepper

Diagonally slice steaks across grain into 1/4 in thick slices. Roll up slices and secure with toothpicks. Place pinwheels in a medium pot and sprinkle with chopped onion. Combine remaining ingredients, stirring well.

Pour marinade over pinwheels. Cover and put in cooler at least 8 hours.

Remove pinwheels from marinade.

Grill over medium-hot coals 14 to 16 minutes or until desired degree of doneness, turning pinwheels frequently.