Pre heat the oven to 200 degrees C ( I use a fan assisted electric oven )
In a small bowl mix the olive oil, garlic, lemon and leaves from the a couple of sprigs of fresh thyme. Place the cauliflower steaks on a baking tray, brush liberally on both sides with the oil and lemon mixture. Add the tomatoes and red onion wedges, give them a brush of oil too. Season with a little sea salt and freshly ground black pepper. Roast in the oven for about 20 minutes or until the cauliflower is tender.
Meanwhile bring a pan of water to the boil, add the lentils and cook for 10 minutes, steam the kale at the same time.
Serve the cauliflower steaks on a bed of kale and lentils, add the roasted tomatoes and onion wedges and serve with some lemon wedges.