Put the oven on 475°F/240°C. Rinse and peel the vegetable. Chop into evenly sized pieces. On a roasting pan add the vegetables and massage the olive oil so that every vegetable gets some oil. Add the sesame seeds, salt and thyme and massage it ones more so that it spreads evenly. Roast for 30-40 min or until lightly brown. Stir occasionally with a wooden spoon. Remove from oven and serve warm or cold, it's still delicious.