Grilled Mole Flank Steak

1 1/2 pounds of Flank Steak

2 Tablespoons brown sugar
1 1/2 teaspoons chipotle chili powder ( or regular chili powder )
1 1/2 teaspoons garlic powder
1 1/2 teaspoons unsweetened cocoa
1/2 teaspoon coarse-grained salt
1/2 teaspoon cracked black peppercorns
1/4 teaspoon cinnamon

Mix together the dry ingredients and coat both sides of the flank steak with them.  Let rest for 20 minutes while you light the grill.  Coat grilling rack with cooking spray.  Grill steak to desired doneness.