While vodka sauce is traditionally served with penne, it is just as delicious with gnocchi or tortellini. It's also a great starting point for a cannelloni recipe. Average proportions are 375 mL (1 ½ cup)tomato sauce for 500 g (1 lb) pasta. Don't throw away all your pasta cooking water: it's a good idea to add a bit to your sauce. Mix in ¼ to ½ cup (or a ladleful) cooking water with the sauce before adding the pasta. The salted, starchy water will enhance flavours and thicken the sauce, helping it stick to the pasta.