1. Cook the broccoli rabe in boiling water for 2 minutes; drain and rinse with cold water.
2. Heat olive oil in a large skillet over medium-high heat. Add onion, red pepper, and garlic to pan; sauté for 3 minutes, stirring occasionally. Add broccoli rabe and 1/2 teaspoon salt to pan, and cook for 2 minutes or until heated, stirring frequently.