Some mexican stuff I'm not sure what to call, but it's good

I've cooked this twice and not really followed a recipe, so apologies if you try it and it's not as good as mine's turned out. Basically it's simmered meat in a variety of spice and peppers and the kind you make burritos, soft tacos, enchiladas or whatever out of.

• Hunk of meat about 4 pounds, I've used pork and cheap beef.
• Some (4-6) whole dried mild peppers (Ancho, Pasilla)
• A can or about a pound of tomatillos
• 1 large chopped onion
• 2 TB chopped garlic
  
• Some tomatoes, canned or stewed or whatever, maybe a cup
• Spices! TB of oregano, tsp of cumin, tsp of ground Ancho, some salt & pepper
• 1 cinnamon stick (yes, that's correct)
  
• Enough water or broth to cover things

Pretty simple, toss it all in a pot and bring to a boil, then simmer for 4-6 hours, the meat will get fall apart tender. Take out the meat and shred. Remove the pepper skins and cinnamon stick from the rest and use a stick blender on the rest and you have a nice sauce.  We put the meat in a tortilla with some cheddar cheese and broil a bit in the oven, top with the meat, sauce maybe some quac and sour cream and enjoy.