Preheat the oven to 200℃.
Cut all the vegetables into slices, wedges or cubes, not too fine and preferably all a little different, which will make the dish look appealing. Keep the different vegetables separate.
Start with the sweet potato and red onion. Put them in a bowl and add the accompanying spices. Shake until the potato and onion are coated with the oil and accompanying spices.
400 g sweet potato, 2 red onions, 1 tbsp chili flakes, 1 tsp ginger powder, 1 pinch cinnamon powder, 1 tbsp olive oil, ¼ tsp salt
Spread the seasoned sweet potato and red onion out on a baking tray lined with baking paper and put in the oven for about 15 minutes. Check the doneness occasionally, especially the sweet potato is cooked much faster than you think .
Now do the same with the parsnips and red bell bell pepper and their seasonings.
200 g parsnip, 1 red bell pepper, 1 tbsp olive oil, 2 tsp oregano, ¼ tsp pepper, ¼ tsp salt
Now roast the seasoned celeriac and cauliflower.
200 g celeriac, 400 g cauliflower, 1 tbsp olie oil, 2 tsp dried thyme, ½ lemon, the grated zest, ¼ tsp pepper, ¼ tsp salt
And finally the green asparagus. Mix with oil, salt and pepper and roast for about 10 minutes. Put the cherry tomatoes in the oven with the asparagus for the last 5 minutes only.
300 g green asparagus, 1 tbsp olive oil, 10 cherry tomatoes, ⅛ tsp salt
When you have roasted all the veggies, arrange everything on a pretty platter. Serve the traybake cold or hot (eat right away or put it all in the oven for a while), drizzle with the tahini sauce and sprinkle with some pangrattato for an extra crunch effect.