Vegetable barley soup

Ingredients

• 1 tablespoon canola oil
  
• 1 onion, chopped
  
• 3 cloves garlic, crushed
  
• 2 carrots, peeled and sliced
  
• 1 large stalk celery, sliced
  
• 200g mushrooms, sliced
  
• 400g can chickpeagarbanzoXsgarbanzosX, drained and rinsed
  
• 2 x 400g cans chopped tomatoes
  
• 1 cup pearl barley
  
• 1 bay leaf
  
• 1 teaspoon dried oregano
  
• 4 cups reduced-salt vegetable stock (plus 2 cups water)
  
• 1 cup green beans, roughly chopped
  
• 1 cup green peas, defrosted if frozen
  
• 1 cup corn sweetcornXkernels, defrosted if frozen
  
• 1/2 cup fresh Italian parsley, chopped, plus extra to serve
  
• ground black pepper to taste