Learn the full recipe by watching the video below.
In a pan, put some oil, then place the beef roast with the seasoned side down.
While its cooking, season the other side of the beef roast.

Image credits: Cooking With Jack Show via Youtube
Flip it to cook the other side.
(confirm to brown all sides evenly.)
After browning the meat, set it aside.

Next, in the same pan, add the chopped onions.
Saute until soft then add the garlic.
Mix them, then put them in a big bowl and set them aside.

Mix it all well.
Lastly, add the chopped celery to the mixture.
Place the beef roast on the slow-cooker.
Pour in the beer and beef broth mixture and the veggies mixture.
Cover the slow cooker and cook it for 8 hours.