- STEP 1
Pre-heat the slow cooker on high.
- STEP 2
Heat the oil in a large frying pan, and fry the onion, carrot, celery and garlic until transparent.
- STEP 3
Add the meat and fry, stirring well, until it is browned and well broken up.
- STEP 4
Stir in the tomatoes, bay leaf and oregano and season to taste with salt and pepper. Transfer to the slow cooker.
- STEP 5
Cook on high for 3-4 hours.
- STEP 6
When almost ready to serve, bring a pan of salted water to the boil and cook the spaghetti. Drain well.
- STEP 7
Remove the bay leaf from the bolognese sauce, and serve with the spaghetti.