Preheat the oven to 180°C. Pack the butternut on a roasting tray and drizzle with oil. Season with salt and pepper. Roast for about 25 minutes or until cooked. Cool slightly
For the dressing, heat all the ingredients in a small saucepan on medium, stirring, for about 3 minutes or until the sugar has dissolved. Cool. Season with salt and pepper.
For the salad, combine all the ingredients with the butternut on a serving dish. Serve with the dressing.