Slow Cooked Beef Ragu Sauce

1 Rub the salt and pepper over the beef.
2 Heat the olive oil in a large, heavy skillet until it sizzles.
3 Add the beef and sear on all sides until it is golden brown.
4 Remove from heat and set aside.
5 Add the remaining ingredients (except the rigatoni and Parmesan) to a slow cooker and place the beef on top.
6 Cook on low for 12 to 16 hours.
7 About 1 hour before serving shred the beef with two forks and stir it into the sauce.
8 Remove any large hunks of fat.
9 Replace the cover and continue to cook.
10 Cook the rigatoni.
11 Drain.
12 Serve the ragu over the rigatoni and pass the Parmesan