Heat olive oil in medium-heavy skillet over medium heat. When hot, add onions and cook, stirring, 2 minutes. Add garlic and chopped chipotles and cook, stirring for 1 minute more. Add tomatoes, reserved soaking water and salt. Bring to simmer and cook, uncovered, until most, but not quite all, of liquid has evaporated, about 5 minutes. Taste and add more salt if needed. (Sauce can be prepared 1 day ahead. Cool, cover and refrigerate. Reheat, stirring, when ready to use.)
Thirty minutes before you cook the steaks, combine cumin, salt and pepper in small bowl. Rub both sides of each steak with seasoning and leave at cool room temperature while you prepare grill.
Arrange rack 5 inches from heat source, oil rack and preheat grill. Grill steaks 3 to 5 minutes per side for medium-rare. Watch carefully. Cooking time will vary, depending on the type of grill and the intensity of heat. Alternatively, broil steaks 4 to 5 inches from heat 3 to 5 minutes per side.
Arrange steaks on serving plate, top each with some sauce and sprinkle with cilantro.
Nutrition information per serving: