You can cook the beef the day ahead in the crockpot, seasoned w/ salt, pepper, and garlic powder Reserve the juices and liquid from the beef, add a little water to it and use that for your beef stock. I like using flank steak, chuck roast, sirloin roast or filet of beef for this dish. If using the crockpot, cook on low for 8 hours or on high for 5-6 hours. If you own a pressure cooker. Cook beef under pressure for 1 hour. Follow recipe as instructed once beef is shredded.