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, smoked paprika, cinnamon stick, cloves, bay leaves, peppercorns, apple cider vinegar, and 1 cup of beef broth in a blender. Blend on high until completely smooth.
03 - Place the beef chuck chunks and short ribs into 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 until the meat is fork-tender and easily pulls apart.
05 - Remove the beef from the slow cooker and shred with two forks. Discard bones. Skim excess fat from the surface of the cooking liquid, then strain the consommé through a fine-mesh sieve and reserve for dipping.
06 - Heat a skillet over medium heat. Lightly dip each corn tortilla in the consommé fat, then place on the skillet. Top with shredded beef and cheese. Fold in half and cook until crispy and golden on both sides, about 2 to 3 minutes per side.
07 - Arrange the tacos on a platter and top with diced white onion, chopped cilantro, and lime wedges. Serve alongside the reserved consommé in small cups for dipping.