Finely chop the onion, garlic and basil and blend the tomatoes in the food processor or blender.
Heat the olive oil, over medium to high temperature, and sauté the onion for 3 minutes. Lower the temperature to medium, add the garlic, sauté for half a minute, add the tomato paste right away and mix well to dissolve and extract all its aroma (for about a minute).
Add the tomato juice, basil and spices and simmer for 10 minutes.
Your sauce is ready!
Serving
Use it as a sauce on pasta or pizza:
In pasta. Serve it over the pasta or boil your half-boiled pasta in it. More specifically, boil the pasta for 2 minutes less than the time suggested on the package and for the last 2 minutes boil it in your sauce (just about the time it is done).
On pizza. Spread it with a spoon on top of your pizza dough.
Notes
The most important ingredient for a successful Napoletana sauce is the tomatoes. Thus, it's important to choose ripe and very tasty tomatoes.
When you make our Napoletana sauce with pasta, start cooking by heating the water for the pasta. That way, they'll be ready almost at the same time as our sauce.
Can be kept in the fridge for 2 days. You can preserve it in the freezer for at least 3 months and have it as a quick solution for the days when your time is limited.