01 - Toast the guajillo, ancho, and pasilla chiles in a dry skillet over medium heat for 2 to 3 minutes until fragrant. Transfer to a bowl, cover with hot water, and let soak for 10 minutes until softened.
02 - Combine the softened chiles, onion, garlic, tomatoes, cumin, oregano, thyme, paprika, cinnamon stick, cloves, bay leaves, peppercorns, apple cider vinegar, and 1 cup of beef broth in a blender. Blend until completely smooth.
03 - Place the beef chuck chunks and short ribs in the slow cooker. Pour the blended sauce over the meat, then add the remaining beef broth and kosher salt. Stir to coat the meat evenly.
04 - Cover and cook on low for 8 hours, or until the meat is fork-tender and easily pulls apart.
05 - Remove the beef from the slow cooker and shred with two forks. Discard the bones. Skim excess fat from the surface of the cooking liquid, then strain the broth through a fine-mesh sieve to produce a clean consommé. Reserve the consommé for dipping.
06 - Heat a skillet over medium heat. Lightly dip each corn tortilla in the fat layer from the consommé, then place on the hot skillet. Fill with shredded beef and cheese, fold in half, and cook until crispy and golden on both sides.
07 - Arrange the crispy tacos on a platter and top with diced white onion, chopped cilantro, and lime wedges. Serve alongside a bowl of warm consommé for dipping.