In a large mixing bowl, combine jicama, turnip, rutabaga, carrot, parsnip, onion, and sweet potato. Drizzle lemon juice over the top of the vegetables and toss to coat.
Combine vinegar, mayonnaise, honey, yogurt, salt, and pepper in a small mixing bowl. Gradually pour over the top of the vegetables and toss to coat. Top with sliced radish and sprinkle with fresh chopped parsley.