Blend the Marinade:In a blender or food processor, combine chipotle peppers, garlic, onion, lime juice, orange juice, vinegar, and all the spices. Blend until smooth.
Prep the Beef: Trim excess fat from the beef. Cut into large chunks and place them into the crock pot.
Add Sauce & Broth: Pour the blended marinade over the beef. Add beef broth or water.
Slow Cook: Cover and cook on low for 8–10 hours or high for 4–6 hours, until the beef is tender and shreds easily.
Shred the Meat: Remove beef from the slow cooker and shred with two forks. Return shredded beef to the crock pot and stir to coat with juices.
Serve: Serve warm in tacos, burritos, bowls, or sandwiches. Garnish with onion, cilantro, lime juice, or your favorite toppings.