In a large bowl, mix the vegetables together. Mix first 6 dressing ingredients together in a small saucepan; bring to a boil. Remove from heat then immediately add in the oil and white sugar; mix to combine until the sugar is completely dissolved, then pour the hot mixture over the veggies. Allow to sit out at room temperature for 1 hour stirring occasionally with a spoon. Cover and refrigerate for 24 hours stirring occasionally, I just keep a spoon in the bowl and just mix every time I open the fridge. Season with freshly ground black pepper (if desired) before serving.