Place coleslaw in non-reactive bowl. Whisk together sugar and next seven ingredients thoroughly, plus onion if using. Pour over coleslaw mix and stir to coat. May add paprika at this point, if desired. Refrigerate at least 2 hours before serving. Note: Mix may seem dry at first, but will loosen up after cabbage reacts to the dressing and releases it's moisture. Also, when I've made my traditional coleslaw recipe, I grate my onion, because I don't like the minced bits.