Roasted cauliflower with tomato and potatoes

Heat half the olive oil into a pan and sauté the onions until they become translucent.

In a pan or an ovenproof dish place the cauliflower, potatoes, onions with their oil, tomato juice, salt, pepper and the remaining olive oil and mix well.

Cover with baking paper and aluminum foil and bake in a preheated oven at 180 degrees until the vegetables are tender, for about 1 1/2 hours.