01 - Arrange flank steak in the base of the crock pot and coat evenly with olive oil.
02 - In a bowl, blend minced garlic, chili powder, paprika, salt, pepper, and cumin. Distribute spice blend thoroughly over the steak.
03 - Scatter chopped onion and cilantro over the steak. Drizzle the juice of one lime over the contents.
04 - Pour beef broth into the crock pot, ensuring it surrounds the steak.
05 - Cover securely. Cook on low for 6–8 hours, or on high for 3–4 hours, until the beef is tender.
06 - Using forks, shred the cooked beef. Pour over the juice from the remaining lime for added freshness.
07 - Melt butter in a large skillet or griddle over medium heat. Fry corn tortillas in the melted butter for 1 minute per side until flexible.
08 - Let tortillas cool slightly. Layer shredded beef over each tortilla and top with preferred garnishes.