Heat water to boil for pasta, season with salt and cook pasta to al dente.
Heat a deep skillet over medium-high heat with extra-virgin olive oil, a turn of the pan. Add bacon and crisp 4 to 5 minutes then add onions and garlic cook to soften, 5 to 6 minutes. Stir in stock then tomatoes and season with pepper to taste. Simmer sauce 15 minutes. Toss pasta with sauce and parsley. Serve with grated sharp white Cheddar.