Heat the oil in a pot, then add the chopped celery, carrots, onions, garlic and crushed chilli pepper.
Sauté on medium-low until the onions are translucent. (about 5 minutes)
Pour in the strained tomatoes.
Fill the strained tomato bottle halfway with cold water. Swirl the bottle to collect any remaining crushed tomatoes, and pour this into the pot.
Add in the salt, pepper and sprigs of fresh basil. Bring to a low simmer.
Once the sauce starts to simmer, add the raw meatballs directly into the tomato mixture and simmer on low heat for approximately 40 minutes. Stir occasionally. (If the tomato sauce gets a little too dry while cooking, you can add some water and stir to incorporate.
When they're ready, you can serve the meatballs as a second course, topped with grated Parmigiano-Reggiano cheese and garnished with fresh basil.
Or, you can serve the meatballs over pasta and even make meatball sandwiches out of them.
The possibilities are endless. Enjoy!