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 rehydrated 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 on high 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 beef is fork-tender and easily pulls apart.
05 - Remove the beef from the slow cooker and shred using two forks. Discard any 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 reserved consommé fat, then place in the hot skillet. Top with shredded beef and cheese, fold in half, and cook until crispy and golden on both sides.
07 - Plate the crispy tacos and top with diced white onion, chopped cilantro, and a squeeze of fresh lime. Serve alongside small bowls of warm consommé for dipping.