1. Combine chile powder, cayenne, cumin and oregano with 1 tablespoon of salt and 1 teaspoon of freshly ground black pepper. Rub the steaks all over with the spice mixture and place on a platter until they come to room temperature.
2. Light the grill or set oven to broil and place rack on top level. Lightly oil a broiling pan and place in oven to heat. Brush the onions with oil and season with salt and black pepper. If using a grill put onions over the hot fire until charred, about 8 minutes. If broiling, set aside.
3. Grill the steaks over the hot fire for 4 to 5 minutes per side for medium rare or broil the steaks 6-7 minutes a side on heated broiling pan along with oil coated onions. Place steaks on plates and top with the onions. Serve Yucca Fries (Yucca Fries (Yuca) Yucca Fries (Yuca)) on the side.