1.Preheat oven to very hot, 240°C (220°C fan-forced). Combine beetroot and one tablespoon of the olive oil on a large oven tray. Roast in a hot oven for 15 minutes.
2.Meanwhile, combine the pumpkin, capsicum, zucchini, red onion, garlic, remaining oil, salt and pepper. Divide the vegetables between the beetroot tray and a second large oven tray. Roast in a hot oven with beetroot for a further 20 minutes or until the vegetables are browned and tender.
3.To make mustard and chive dressing, combine all ingredients in a screw-top jar; shake well.
4.Peel the beetroot. Top vegetables and beetroot with blue cheese and walnuts. Drizzle with mustard and chive dressing.
Not suitable to freeze. Not suitable to microwave.