Note
1. Pass the tomatoes, including their juices, through a food mill and into a large bowl.
2. Heat the oil in a large sauté pan over medium-high heat for 2 to 3 minutes until the oil is almost smoking and slides easily around the pan.
3. Add the tomato purée slowly as it will splatter when it hits the oil.
4. Use the passata or set it aside to cool to room temperature, then transfer it to an airtight container and refrigerate for up to several days or freeze for up to several months.