Chicken, Cheese and Arugula Salad

Ingredients

• 5 1/2 oz/150 grams arugula leaves
• 2 celery stalks, trimmed and sliced
• 1/2 cucumber, sliced
• 2 scallions, trimmed and sliced
• 2 tablespoons chopped fresh parsley
• 1/4 cup walnut pieces
• 12 oz/350 grams boneless roast chicken, sliced
• 4 1/2 oz/125 grams blue cheese, cubed
• handful of seedless red grapes, cut in half (optional)
• salt
• pepper
• 2 tablespoons olive oil
• 1 tablespoon sherry vinegar
• 1 teaspoon whole grain mustard
• 1 tablespoon chopped fresh mixed herbs