1. Preheat broiler.
2. Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add onion to pan. Cover and cook 3 minutes. Add vinegar, honey, and 1/4 teaspoon salt to pan. Reduce heat, and simmer, uncovered, 8 minutes or until slightly thick, stirring occasionally.
3. Sprinkle remaining 1/4 teaspoon salt, thyme, and pepper evenly over beef. Place beef on a broiler pan coated with cooking spray; broil 4 minutes on each side or until desired degree of doneness. Serve with onion mixture.
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