Combine seasoning ingredients in small bowl; remove and reserve 2 tablespoons. Press remaining seasoning evenly onto beef steaks; set aside. Combine reserved seasoning, oil and salt in large bowl. Add potatoes; toss to coat.
Place steaks on grid over medium, ash-covered coals; arrange potatoes around steaks. Grill steaks, covered, 10 to 14 minutes (over medium heat on preheated gas grill, 9 to 14 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally. Grill potatoes 14 to 17 minutes (over medium heat on preheated gas grill, 13 to 15 minutes) or until tender, turning occasionally.
Carve steaks into slices; season with salt, as desired. Sprinkle green onion over potatoes. Serve potatoes with Sour Cream and Onion Sauce for dipping, if desired.
Sour Cream and Onion Sauce: Combine 1/2 cup dairy sour cream and 2 tablespoons minced green onion. Sprinkle with smoked or Spanish paprika, as desired. Yield: 1/2 cup
Nutrition information per serving: 807 Calories; 261 kcal Calories from fat; 29 g Total Fat; 8 g Saturated Fat; 9 g Monounsaturated Fat; 145 mg Cholesterol; 768 mg Sodium; 70 g Total Carbohydrate; 7.7 g Dietary Fiber; 65 g Protein; 7.3 mg Iron; 20.9 mg NE Niacin; 2.3 mg Vitamin B6; 3.1 mcg Vitamin B12; 11.6 mg Zinc; 69.4 mcg Selenium;