INGREDIENTS
•
Cooking spray
•
1 large red onion, sliced and separated into rings (about 2 cups)
•
2 tablespoons red wine vinegar
•
2 tablespoons honey
•
1/2 teaspoon salt, divided
•
1 teaspoon dried thyme
•
1/4 teaspoon freshly ground black pepper
•
4 (4-ounce) beef tenderloin steaks, trimmed (1 inch thick)