1 tablespoon cocoa powder
2 tablespoon brown sugar
2 tablespoons ancho chili powder
1 teaspoon cinnamon
2 teaspoon salt
1/2 teaspoon black pepper
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
1/4 cup olive oil
1 (1 1/2- to 2-pound) steak (such as flat-iron, flank or skirt steak)
In a small bowl, combine the cocoa, sugar and spices. Stir to combine well. Stir in the olive oil to make a thick paste.
Spread mixture on all sides of the steak. Place in a plastic, resealable bag and allow to marinate, refrigerated, for 8 hours or overnight.
When ready to cook, remove steak from marinade. Grill or broil steak until it reaches desired doneness (about 145 F on an instant-read thermometer for medium).
Remove steak from heat. Cover with foil and let rest for 10 minutes before slicing. Makes 4 servings.