Bring a pot of water to a boil. On the bottom of each tomato make a gentle "X" in each tomato, just cutting through the skin (this will help them peel).
Working in batches boil the tomatoes until skin starts to detach from each tomato. Place in an ice bath when ready to remove.
Carefully peel cooled tomatoes. Place tomatoes in a blender or food processor and blend.
Meanwhile heat the oil in a skillet. Cook garlic and onion mixture for 8 - 10 minutes, stirring occasionally (avoid burning the garlic).
Pour in the tomato sauce, stir in half the torn basil, and simmer for 25 - 30 minutes, stirring occasionally.
Finish with remaining torn basil. Use immediately or cool and jar for later use.
Notes
Blender is optional. If you prefer you can cook down and crush tomatoes as they cook. This speeds up the process.
Keyword Basil, Fresh Herbs, Marinara, olive oil, Pasta Sauce, Pomodoro, San Marzano, Tomatoes, Under 500 Calories