Classic Pomodoro Sauce
Place a large saucepan over medium heat. Add all of the olive oil followed by the onions. Sweat the onions for 5 minutes then add the garlic and basil. Stir the pot a bit and cook for another few minutes before adding the fresh tomatoes only.
When the fresh tomatoes are very soft you may add the crushed tomatoes and reduce to a simmer. Let it cook on low heat uncovered for at least 45 more minutes. If the sauce becomes too thick just add a bit of water and stir.
Taste the sauce for salt level and then blend for 5 seconds in a blender.