Fast fish pie - Good Food Middle East

Ingredients

• 5 tbsp olive oil
• 2 sticks celery, chopped
• 1 garlic clove, sliced
• 200g pack cherry tomatoes, stems removed and halved if large
• 1 tbsp tomato purée
• 300g skinless boneless white fish fillets, cut into chunks
• 100ml vegetable stock or white wine
• 100g cooked prawns
• 2 sprigs tarragon, chopped
• 750g potatoes, peeled and quartered
• 2 spring onions, chopped