1. Heat oil in a small pot
2. Grate the garlic into the oil, saute until fragrant
3. Add the onions, saute until transparent
4. Skin the tomatoes as much as you can, chop and add to the pot
5. Add basil, salt and pepper
6. Cook on medium, for 35 to 40 minutes, stirring occasionally
7. Transfer into the food processor and pure very well
8. Pour back into the pot and cook for another 10 minutes.