Combine the chili sauce, lime juice, brown sugar, pepper flakes and 1/4 teaspoon salt; brush over steaks. Broil steaks 4-6 in. from the heat for 5-7 minutes on each side or until meat reaches desired doneness (for medium-rare, a meat thermometer should read 145°; medium, 160°; well-done, 170°).
Meanwhile, in a large skillet, saute onion and green and yellow peppers in oil until tender. Add the garlic, pepper and remaining salt; cook 1 minute longer. In a small bowl, combine sour cream and horseradish. Serve steaks with pepper mixture and sauce. Yield: 4 servings.