Pre-heat the oven to gas 6, 200°C, 180°C.
Arrange the vegetables in a large roasting tray. Drizzle with the olive oil, balsamic vinegar, a sprinkle of sugar and oregano on top. Season well, then toss together a few times to combine evenly. Roast for 35-45 minutes until soft and lightly coloured.
Remove and garnish with the sprigs of oregano (optional). Serve immediately.
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