Chicken breast: 150 g (5 oz, diced), Carrots: 100 g (1 cup, diced), Celery: 50 g (1/2 cup, diced), Onion: 50 g (1/2 cup, chopped), Garlic: 5 g (2 cloves, minced), Water: 500 ml (2 cups), Pearl barley: 30 g (2 tbsp, uncooked), Olive oil: 5 g (1 tsp), Fresh parsley: 5 g (1 tbsp, chopped), Salt & pepper: to taste