Minced beef & sweet potato stew - Good Food Middle East

Ingredients

• 1 tbsp sunflower oil
• 1 large onion, chopped
• 1 large carrot, chopped
• 1 celery stick, sliced
• 500g lean minced beef
• 1 tbsp tomato purée
• 1 tbsp mushroom ketchup
• 400g can chopped tomatoes
• 450g sweet potatoes, peeled and cut into large chunks
• few thyme sprigs
• 1 bay leaf
• handful parsley, chopped
• Savoy cabbage, to serve