Heat the oil in a saucepan and gently cook the onion ... Stir in the tomatoes, chili flakes, vinegar and sugar. 3. Bring to a simmer and cook slowly for 45 minutes to 1 hour. 4. Stir in the basil and ...

He noticed that home-cooking recipes often involved too much onion and not enough oil compared to the professional ones. To come up with a rich sauce that retains the refreshing flavor of tomato ...