Beef mince & tomato ragu

Name: Beef mince & tomato ragu
Prep time: 15 min
Cook time: 3 h
Total time: 3 h 15 min
Cuisine: European, Italian, Mediterranean
Ingredients: 400g spaghetti or other pasta; 100g cherry tomatoes , quartered (use a mix of colours); 1 tbsp mascarpone; 1 bunch basil , roughly chopped; parmesan , to serve; 1 tbsp olive oil; 1 small onion , finely chopped; 1 garlic clove , crushed; ½ celery stick, finely sliced; 1 small carrot , finely chopped; 500g beef mince , 10% fat; 3 tbsp tomato & vegetable purée; 200ml passata; 50ml milk