Spaghetti alla Amatriciana

Yield: 4 servings
Ingredients
- 4 oz. Guanciale, sliced thin
- 1 medium Onion, chopped
- 28 oz can Tomatoes, crushed by hand
- 3 cloves Garlic, chopped
- 2 Tbs Olive Oil
- Salt & Pepper
- 10 oz. Spaghetti or bucatini
- Chopped fresh parsley
- Grated Pecorino