Vegetables: begin layering the vegetables into the slow cooker starting with the onions. Then add the carrots and celery.
Beef: next add the beef mince, garlic, salt, pepper and Italian herbs.
Liquids: next add the tomato paste, Worcestershire sauce, passata, diced tomatoes and beef stock to the slow cooker.
Stir: when ready take a wooden spoon and gently stir to combine all of the ingredients and then place the 2 bay leaves on top in the centre of the bowl. Next pop the lid on and set the timer for 5 hours and 30 minutes on low or 3 hours and 30 minutes on high.
Pasta: in the final 15 minutes of the cook time read and follow the package directions to cook the pasta in a medium sauce pan of boiling water. Moments before it is al dente use a heatproof jug to scoop out 1-2 cups of the pasta water and then set this aside. Then use a colander to drain the pasta, discarding the rest of the water.
Combine: remove the lid from the slow cooker and add in the hot drained pasta. Then measure ½ cup (125 ml) of the pasta water and add this to the slow cooker also. Use the spoon again to gentle toss, stir and combine till the pasta and sauce is consistently mixed. Then use the back of the spoon to smooth the surface into one flat layer.
Cheese: next grate some fresh cheese over the top of the pasta, sprinkle over some black pepper and add some basil leaves.
To serve: provide bowls, forks and spoons. Portion and serve.