Cut up Pork into bite sized chunks
Place serrano, tomatillo, and tomato on a baking sheet and broil until outside is charred
Add Oil to Dutch Oven
Brown Pork
Add Onion, cook down about 2 minutes
Add the broth and rest of the ingredients
Place serrano, tomatillo, and tomato in a blender with a little cooking liquid to blend, add mixture to Dutch Oven
Bring to a boil and then simmer for several hours, letting the stock cook down, adding more as needed