Rinse the kale thoroughly, pat dry, and tear leaves into bite-sized pieces.

Drizzle olive oil and salt over kale, then massage gently for 1–2 minutes.

Core and slice crisp apples and red onion into thin strips.

In a bowl, toss together the prepared kale, apples, onion, walnuts, and cranberries.

In a small bowl, whisk together olive oil, vinegar, mustard, honey, salt, and pepper.

Drizzle the dressing over the salad, gently tossing to coat.

Chill the salad for 10 minutes before serving.