Preheat oven to 200°C.
Top and peel the vegetables and chop into chunks. Toss them in the oil and fennel seeds. Roast until tender, approximately 45 minutes.
Place the onion into Thermomix bowl with a drizzle of extra EVOO and chop 3 sec/speed 5. Sauté 5 min/Varoma/speed 1.
Add roasted veggies, oil and seeds to Thermomix bowl, reserving some of the oil with the seeds in it. Add liquid stock and salt and cook 8 min/100°C/speed 1.
Blend 1 min/speed 10. Serve drizzled with the reserved oil and toasted fennel seeds.