Bucatini all'Amatriciana

Ingredients

• bucatini (tube pasta that looks like spaghetti with a hole down the center of it)
  1 pound
• salt
  1 unit
• extra-virgin olive oil

  2 turns of the pan in a slow stream
  2 tablespoons
• pound

  4 or 5 slices, pancetta , chopped
  ¼ unit
• onion

  chopped
  1 medium
• garlic

  chopped
  4 to 6 cloves
• crushed red pepper flakes
  1 teaspoon
• (28 ounce) can crushed tomatoes
  1 unit
• chopped flat-leaf parsley
  2 tablespoons
• freshly ground black pepper
  1 unit
• grated Parmigiano-Reggiano

  Grana Padano or romano, to pass at the table
  1 unit