1. Heat the oil in a large saucepan over medium heat. Add the onions and diced carrots, and saute until the onions start to turn translucent.
2. Add the garlic, herbs, chilies, tomatoes, tomato puree, salt, and sugar. Pour in 1/2 cup water. Lower heat and bring to a simmer for 40 minutes. Leave uncovered so the sauce can reduce.
3. At the halfway (20 minute) mark, stir the sauce and check its saucy state. There should be liquid, but we want it as thick as possible; add water sparingly.
4. Adjust seasonings, and remove from heat until cool enough to blend. Blend to desired consistency.
Andiamo a mangiare! Marinara is a fresh tomato based sauce for pastas; it's especially good with gnocchi!
Source of recipe: A traditional recipe with many variations. Here is a yummy one.