Yes, you can make it ahead. Once you've completed all the steps, let it cool to room temperature and store it in an airtight container in the refrigerator. It will keep for three to four days. You can also store it in the freezer for several months. I think it tastes even better the next day, so I usually make it a day in advance so the flavors can develop even more. When you warm it up, you may need to add a few splashes of water or wine to thin the sauce because it will thicken up when it's chilled.