Mix the vinegar, lemon juice, honey, salt, and pepper. Gradually blend in the oil, whisking thoroughly.
Place the kale and onion in a large bowl. Add the dressing, setting aside 3 Tablespoons, massaging it into the leaves. Allow to sit for 30 minutes.
Place the kale mixture on a large platter adding the chopped chicken, orange slices, fresh raspberries, feta cheese and nuts.
Drizzle the remaining dressing on top; toss to serve.