Curried vegetable broth - Good Food Middle East

Ingredients

• 1 tbsp olive oil
• 1 medium onion, finely chopped
• 2 medium sticks celery, chopped
• 1 large potato, chopped
• 2 carrots, chopped
• 1 parsnip, chopped into large chunks
• 2 tbsp mild vegetarian curry paste
• 1 tbsp plain flour
• 850ml vegetable stock
• 2 tbsp double cream
• 15g butter
• 1 large onion, finely sliced
• 2 tbsp chopped fresh coriander