In a large salad bowl, combine the fresh arugula, core and thinly slice the apples, and add them to the bowl. Include the toasted walnuts and crumbled feta.

In a small mixing bowl, whisk together the olive oil, apple cider vinegar, honey, salt, and pepper until smooth.

Drizzle the vinaigrette over the salad mixture, ensuring it covers all the ingredients.

Using salad tongs, gently toss the salad to coat the ingredients evenly with dressing.

Plate the salad into bowls and serve immediately, garnishing with additional feta or walnuts if desired.