In a large skillet, heat 3 tbsp. olive oil over medium heat. Add diced onion to the pan and saute until the onion turns translucent. Add garlic and saute for 2 more minutes or until fragrant, stirring occasionally.
Continue cooking the sauce, until the sauce reaches a low simmer. Reduce heat to medium to maintain a steady simmer for 25 - 30 minutes.
Add water to get the consistency you prefer.
1/4 cup Water
Notes
You will have enough sauce for 16 ounces of pasta.
Red pepper flakes are optional.
If the sauce thickens more than you would like, you can thin out with additional water.
If using whole tomatoes you can either add the tomatoes to a blender or use an immersion blender to get a smooth sauce.
If you want to use this recipe as pizza sauce, you can omit the water and add 1 - 2 tablespoons of tomato paste.
For large families, double or triple the recipe.
Add a parmesan rind to build flavor in the sauce while the soup simmers.
Garnish with fresh basil ribbons.
Storage:Fridge: This authentic sauce can be stored in an airtight container in the refrigerator for up to 5 days.Freezer: Cool the marinara completely and store it in an airtight container for up to 6 months in the freezer. You can also use a freezer bag to store the sauce. I recommend double bagging the sauce and labeling it with the date.