I got this recipe from Lidia Bastianich's cookbook. It's a great recipe, the only change I made was I added garlic (my favorite ingredient). You can make this ahead and freeze it. So much better than jar sauce! If you cannot get San Marzano tomatoes, I recommend Colivata or Cento brands.
- In large pot, on medium head add olive oil, carrots and celery. Cook stirring occasionally for 5 minutes.
- Reduce heat to low, add onion, crushed red pepper flakes (if using) and garlic cook for 5 minutes stirring constantly (being careful not to burn garlic).
- Add crushed tomatoes, water and salt, raise heat to med and bring to a boil. Reduce heat to low, cover and cook for 1/2 hour stirring occasionally. Remove and discard bay leaves.