Tear the chiles into smaller pieces and toast in a medium-sized dutch oven set over medium heat for 1-2 minutes. Transfer toasted chiles to a blender, cover with 1 cup of very hot tap water, and allow to sit for 10 minutes. Blend the chiles and water until smooth. Toast the cumin and coriander seeds in the now empty pot for a minute or two, until fragrant, and then grind in a mortar and pestle until finely ground. Add the chile powder, cocoa powder, and kosher salt and stir to combine. Add the beef fat (or bacon fat, or oil) to the dutch oven, set over medium heat. Brown the diced beef in two batches, and then remove to sit on a plate. Add the onions to the pot and cook for 5 minutes, until soft and caramelized, being sure to scrape up the beef bits on the bottom of the pot. Add the minced garlic and spice blend, and cook for 30 more seconds. Add the browned beef and any accumulated juices, the chile puree, the cinnamon stick, and the bottle of beer. Bring to a boil and then turn the heat to low and simmer for 3 hours. Stir in the semolina and season the chili to taste with kosher salt. To assemble the Frito Pies, cut open the front of the bags of Fritos, and top each with a few spoonfuls of chili, shredded cheddar cheese, minced onion, and a dollop of sour cream. I hope you like it!