Beef ragù pasta bake

Name: Beef ragù pasta bake
Prep time: 15 min
Cook time: 1 h
Total time: 1 h 15 min
Cuisine: Chinese
Ingredients: Low-calorie cooking spray; 1 onion, finely chopped; 2 celery sticks, finely chopped; 1 large carrot, peeled and finely chopped; 3 garlic cloves, finely chopped; 250g chestnut mushrooms, finely chopped; 500g lean beef mince (5% fat or less); 700g jar passata; 8 tbsp tomato purée; 250ml beef stock; 1 tsp dried mixed herbs; 400g dried conchiglioni; Handful of fresh basil leaves, finely chopped; 200g mozzarella, cubed