This Roman sauce starts with onion sautéed in oil and butter, then pancetta is cooked briefly before the tomatoes go in. After a gentle simmer, the sauce is tossed with pasta and finished with Parmigiano-Reggiano and Romano.

Ingredients
Equipment
Method
- Put the vegetable oil, butter, and chopped onion in a saucepan over medium heat. Sauté until the onion turns a pale gold, then add the pancetta and cook about 1 minute, stirring once or twice.
- Add the tomatoes, chili pepper, and salt. Simmer uncovered at a steady, gentle simmer for 25 minutes. Taste and adjust salt and hot pepper.
- Toss the pasta with the sauce, then add both cheeses and toss thoroughly again.