Spaghetti Bolognese

Nathaniel, who is learning how to cook as part of his Duke of Edinburgh Award, asked me to show him how to make Spaghetti Bolognese, one of his favourite dishes.

2 lbs mince beef
2 onions, finely chopped
4 garlic cloves, minced
2 carrots, diced
2 celery sticks, diced
2 bay leaves
Pinch of thyme
1 tsp paprika
Salt and pepper
Olive oil