01 - Toast the dried 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, quartered onion, garlic cloves, quartered tomatoes, cumin, oregano, thyme, smoked paprika, cinnamon stick, whole 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. Add the remaining beef broth and kosher salt. Stir to evenly coat all the meat pieces.
04 - Cover and cook on low for 8 hours until the beef is fork-tender and easily pulls apart.
05 - Transfer the beef to a cutting board and shred using two forks. Discard any bones. Skim excess fat from the surface of the cooking liquid, then strain the remaining 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. Add a portion of shredded beef and cheese to each tortilla, fold in half, and cook until golden and crispy on both sides, about 2 minutes per side.
07 - Arrange the crispy tacos on a platter and top with diced white onion, chopped cilantro, and a squeeze of fresh lime. Serve alongside small bowls of hot consommé for dipping.