Dinner Tonight: Spaghetti all'Amatriciana | Food Stuff

Ingredients

• 1 1/2 cups basic tomato sauce, or a 14-ounce can of tomatoes
• 1 cup flat-leaf parsley, leaves only
• 3 cloves garlic
• 1/2 pound guanciale or pancetta, thinly sliced and cut into small pieces
• 1 pound pasta, traditionally bucatini
• Pecorino Romano cheese, for grating
• 1 large red onion, halved and sliced 1/2-inch thick
• 1 teaspoon hot red pepper flakes
• Salt and freshly ground black pepper, to taste