Here In AZ Machaca is pretty easy to find. I got this recipe from a friend and it doesn't use anything hard to find and it has great flavor.
Hope this helps
Slow Cooker Beef Machaca
Original recipe yields 8 servings
Ingredients
1 (4 pound) boneless beef chuck roast, trimmed and cut into 8 portions
½ cup olive oil
¼ cup Worcestershire sauce
2 limes, juiced
1 (14 ounce) can diced tomatoes, undrained
1 large sweet onion, diced
½ green bell pepper, diced
4 cloves garlic, minced
1 jalapeno pepper, seeded and minced
½ cup beef broth
1 tablespoon dried oregano
1 tablespoon ground cumin
1 teaspoon chili powder
½ teaspoon salt, or more to taste
½ teaspoon ground black pepper
Directions
Step 1
Place beef portions into the crock of a large slow cooker. Mix olive oil, Worcestershire sauce, lime juice together in a bowl; pour over the beef. Add diced tomatoes, sweet onion, green bell pepper, garlic, jalapeno pepper, beef broth, oregano, cumin, chili powder, salt, and black pepper to the slow cooker.
Step 2
Cook on High for 1 hour. Change setting to Low and continue cooking until the beef is tender, about 6 1/2 hours.
Step 3
Remove beef with tongs to a cutting board. Shred with a pair of forks and return to the slow cooker. Continue cooking another 20 to 30 minutes.
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