Leftover roast soup

Ingredients

• 1 reduced-salt chicken stock cube
• 1 litre hot water
• 1 tablespoon olive oil
• 1 medium onion, diced
• 2 medium carrots, peeled and diced (raw or pre-cooked leftovers)
• 200g new potatoes (quartered) or larger/baking potatoes (diced) (raw or pre-cooked leftovers)
• 200g green vegetables, diced (raw or pre-cooked leftovers)
• 200g cooked chicken or turkey, diced
• Fresh or dried thyme or sage
• Freshly ground black pepper
• 200g frozen peas (optional – instead of fresh or leftover greens)