- Heat olive oil in a large, heavy skillet over medium heat. 
- Add the diced pancetta and sauté until golden brown, about 8 minutes. 
- Add the chopped onion to the skillet and sauté until tender, around 5 minutes. 
- Stir occasionally to prevent sticking. 
- Pour in the white wine, and stir, scraping up brown bits from the bottom. 
- Allow it to reduce slightly for about 2 minutes. 
- Add the peeled tomatoes and red pepper flakes. 
- Break up the tomatoes with a spoon and simmer on low heat for 15 minutes. 
- Season with salt to taste, stirring occasionally to incorporate flavors. 
- Adjust the seasoning as needed.