A rich, meaty, and zesty "ragu". Bolognese Sauce is the backbone of Northern Italian cooking, and once you try it you'll never toss your spaghetti with store-bought pasta sauce again. However, there are as many recipe versions of this delicious slow-cooked sauce as there are cooks in the Italian city of Bologna. The secret ingredient to a true Bolognese Sauce is milk (or cream), which is added in such small amount, you don't even know it's there. TIP: Bolognese Sauce is best made the day before to allow the flavors to develop. Cool the sauce, uncovered, and then refrigerate in an airtight container. Can also be frozen.