Combine 1/4 cup cider vinegar, 1 tablespoon miso paste, 1 teaspoon garlic, 1 teaspoon ginger and 1/2 teaspoon pepper in small bowl. Place beef steaks and marinade in food-safe plastic bag; turn steaks to coat. Close bag securely and marinate in refrigerator 30 minutes.
Meanwhile, to prepare bulgogi sauce, heat large nonstick skillet over medium-high heat until hot. Add apple, brown sugar, onion, remaining 1/4 cup cider vinegar, remaining 2 tablespoons miso paste, remaining 1 teaspoon garlic, remaining 1 teaspoon ginger, remaining 1/2 teaspoon pepper and sesame oil; bring to a boil. Cook 8 to 12 minutes or until sauce thickens, stirring occasionally. Season with salt, as desired. Set aside.
Remove steaks from marinade; discard marinade. Place steaks on grid over medium, ash-covered coals. Grill, covered, 10 to 14 minutes (over medium heat on preheated gas grill, 12 to 16 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally.
Carve steaks into slices. Divide steak slices evenly among 12 lettuce leaves. Top steak with Bulgogi Sauce, carrots, cabbage, cucumber, peanuts, microgreens, pickled vegetables and kimchi, if desired.
Nutrition information per serving: 406 Calories; 108 Calories from fat; 12g Total Fat (4 g Saturated Fat; 5 g Monounsaturated Fat;) 71 mg Cholesterol; 624 mg Sodium; 53 g Total Carbohydrate; 2.3 g Dietary Fiber; 24 g Protein; 3 mg Iron; 3.5 mg NE Niacin; 0.4 mg Vitamin B6; 5 mcg Vitamin B12; 7.8 mg Zinc; 32.7 mcg Selenium; 96.8 mg Choline.
This recipe is an excellent source of Protein, Niacin, Vitamin B6, Vitamin B12, Zinc, and Selenium; and a good source of Iron, and Choline.