Simple sauce made with plump San Marzano tomatoes, fresh basil, onion and garlic.
Sweat the onions in the oil until wilted. Add the garlic and sweat from another 3 minutes. Add the tomatoes, half the basil (on the stem) and the pepper; cover and simmer for 60 mins. Remove the basil. Pass through a food mill fitted with a medium disc into a clean pot, or use an immersion blender. Return to a simmer and add the remaining basil leaves and salt to taste.