Take 1 medium-sized beetroot, cut off the tail and top, add salt, pour vegetable oil (I used walnut oil). Wrap the beetroot in foil and bake in the oven for 35 minutes at 200C. Meanwhile, peel and chop the carrots, parsnips and sweet potatoes into rather large pieces. Finely chop the red onion into quarters. Season the vegetables with salt, pour vegetable oil and send them to the baking tray where our beets are baked. Bake the vegetables together for another 35 minutes.