Crunchy carrot salad

Name: Crunchy carrot salad
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Cuisine: European, British
Ingredients: ½ orange; 6 sprigs fresh flat-leaf parsley; 30 g orange juice; 450 g carrots; 250 g green apple; 2 celery stalks; 1 pinch sea salt; 60 g walnuts; 1 tbsp olive oil