Scrub beets and trim tops to 1 in. Place in a Dutch oven; add water to cover. Bring to a boil. Reduce heat; simmer, covered, 30-60 minutes or until tender. Remove from the water; cool., Peel beets and cut into 1/2-in. cubes. In a large bowl, combine the apples, kale, cabbage, carrots, onion and beets., In a small bowl, whisk the remaining ingredients. Pour over salad; toss to coat. Refrigerate, covered, for at least 4 hours or until chilled, stirring occasionally.