Preheat the oven to 425 degrees F (if you have a convection oven preheat to 400 degrees F). Line two large baking sheets with parchment.
Put the vegetables into a bowl, add the oil and season with salt and pepper. Toss until coated. Arrange in a single layer on the baking sheets.
Roast in the oven for 30–40 minutes, or until golden and little crisp Leave to cool on the baking sheets.
For the dressing, measure all of the dressing ingredients into a small bowl. Mix well and season with salt and pepper.
Put the vegetables on a serving platter or in a bowl. Pour over the dressing and check the seasoning. Sprinle with the feta., mint and basil and serve.