1. 1. Preheat the oven to 400°F (200°C).

2. 2. Wash the broccoli rabe, red cabbage, and bulb fennel.

3. 3. Cut the broccoli rabe into bite-sized pieces.

4. 4. Thinly slice the red cabbage and fennel bulb.

5. 5. Place the broccoli rabe, red cabbage, and fennel on a baking sheet.

6. 6. Drizzle with olive oil and season with salt and pepper.

7. 7. Roast in the oven for 20-25 minutes, or until vegetables are tender and slightly caramelized.

8. 8. Serve hot as a side dish or over quinoa for a complete meal.