Wash the tomatoes thoroughly under running water. Use a knife to remove the stems, if there are any.
Place the fresh tomatoes in a pot of boiling water for a few minutes to blanch them.
Drain the tomatoes and let them cool for 10 minutes.
Cut the tomatoes in half, peel off the skin and remove the seeds. If you're using peeled San Marzano tomatoes, you can skip this step.
Place the tomatoes into a food mill with large holes or using the coarse disc. Turn mill to give you tomato pulp that isn't too smooth or homogeneous. Collect any leftover sauce and pulp from the bottom of the sieve and add it to the rest of the sauce.
Adjust the acidity of the sauce by adding a pinch of baking soda or bicarbonate of soda. Taste and add more bicarbonate of soda if needed.
Add a pinch of salt to taste.
Your Neapolitan perfect pizza sauce is ready to use and make a true Neapolitan pizza at home.