Use a heavy pot or Dutch oven to maintain even heat and prevent the beef from drying out. Brown the beef in batches to ensure a good sear; overcrowding the pan will steam the meat instead. Don’t skip the lime juice—it brightens the richness and balances the spices. For an even deeper flavor, marinate the beef in the spice mix overnight in the refrigerator. If short on time, a slow cooker or Instant Pot can be used for cooking the beef; adjust cooking times accordingly. Use fresh tortillas for the best texture, or lightly toast store-bought tortillas before serving.