Heat the oil in a large pan on medium high heat, when hot, add the roast, cook 6-8 minutes, browning all sides.
When browned all over, place the roast in your slow cooker.
Same hot pan, add the onions, peppers, and garlic. Saute for 5-7 minutes or until the onion is tender.
Add the cooked onions and peppers to the slow cooker.
Stir in the crushed tomatoes. Cover the slow cooker and set to Low Setting and cook for 4-5 hours or until the beef shreds easily.
Remove beef to a cutting board, shred with two large forks.
Return the beef to the slow cooker. Stir in the beer, cumin, and hot sauce. Heat for 5-10 minutes.
Serve with cornbread or cooked rice, as desired, enjoy.