Ingredients

• 1 tablespoon olive oil
• 2 pounds red onions, cut crosswise into 1/2inch thick slices
• Coarse salt
• Freshly ground black pepper
• 2 tablespoons balsamic vinegar
• 1 teaspoon chopped fresh rosemary

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Instructions

1. Heat a clean griddle and brush with 1/2 of the oil. Brush onion slices lightly with remaining oil on both sides, season with salt and pepper and place on griddle. Grill for 3 to 5 minutes on each side, or until softened and lightly charred. Transfer onions to a bowl, drizzle with vinegar and sprinkle with rosemary. Toss to separate rings and season with more salt and pepper as needed.