Set oven control to broil. Line 2 cookie sheets with foil. In medium bowl, place onion and 1 tablespoon olive oil; toss to coat. Sprinkle with salt and pepper; toss. Place onion in single layer on 1 cookie sheet. Broil 4 to 6 inches from heat about 10 minutes, stirring occasionally, until onion is soft and begins to brown. Set aside.