Preheat the oven to 450. Peel and chop the vegetables. Put all the vegetables into a bowl, add the coriander, turmeric, curry powder, cumin, salt and pepper. Add the oil and toss to coat. Spread the vegetables on a baking sheet in a single layer. Roast for 20 minutes, or until just tender. Put into a bowl and toss with freshly grated ginger. Serve warm or at room temperature.