In a heavy skillet toast cinnamon, allspice, cumin, oregano and coffee over medium heat until fragrant, about 1 minute. Cool, add salt and grind in a spice grinder to a fine powder.
Season beef evenly with spice blend. Cover tightly with plastic or put in a zip lock; refrigerate overnight.
Put dried peppers in a pot with 3 cups beef stock over medium-high heat. Bring to a boil, cook 5 minutes, turn off heat and cover with a lid.
In slow cooker combine beef, onion, garlic, tomato paste, vinegar and chili peppers with stock. Cook on high 1 hour then on low for 6 hours to fork-tender.
When beef is cool enough to handle, hand shred. Put cooking liquid and vegetable mixture in a food processor or blender and puree until smooth; combine with shredded beef. Serve with warm soft tortillas, lime wedges and optional ingredients
Recipe by Certified Angus Beef brand blog - Go Rare at https://blog.CertifiedAngusBeef.com/2015/01/barbacoa-burrito/