Cut the pancetta into small pieces
Sauté chopped onion in 1Tbsp olive oil until lightly golden
Add pancetta, continue to sauté a few minutes
Add tomato sauce, salt, pepper, parsley
Add ½ cup water
Bring to a boil
Reduce heat and simmer for about 15 minutes
Add a teaspoon of sugar and a teaspoon of balsamic vinegar. Let simmer for 2 minutes
Adjust the salt, sugar and vinegar to taste.
Mix sauce with cooked pasta, top with Parmesan or Pecorino cheese and serve.