In a large skillet over medium-high heat, add olive oil. Once hot, sear the beef chunks on all sides until browned (about 4-5 minutes). Transfer the beef to the slow cooker.
In the same skillet, add chopped onion, carrot, celery, and minced garlic. Sauté for about 3-4 minutes until softened.
Add the sautéed vegetables to the slow cooker with the beef. Then add the crushed tomatoes, tomato paste, beef broth, oregano, basil, salt, and pepper. Stir everything to combine.
Cover and cook on low for 8 hours or high for 4 hours until the beef is tender and shreds easily with a fork.
Once cooked, use two forks to shred the beef in the slow cooker, mixing it into the sauce.
Serve the ragu over your choice of pasta or polenta. Top with fresh basil leaves and grated Parmesan cheese.
Notes
Serve with fresh basil and grated Parmesan cheese for added flavor.