Season pork pieces on all sides with salt and pepper.

Heat a large stock pot over high heat. Add oil. Once hot, sear the pork pieces until browned on all sides.

Remove the pork from the pot. Add a little additional oil to the pan, if needed.

Add onion and saut? until tender. Add garlic and cook for 30 seconds.

Stir in the cumin and oregano. Return pork to the pot and add the chicken broth.

Reduce heat to medium-low, cover, and simmer for 2-4 hours.

While the pork simmers, place rack on second to top level of oven and turn the oven to high broil.

Lightly spray a jelly roll pan with cooking oil. Wash the poblano peppers, jalape?os, and tomatillos.

Slice the tomatillo and both types of peppers in half, and remove stems. Seed the peppers and remove the white veins inside if desired.

Place the poblano peppers, jalape?o, and tomatillos on baking sheets cut side down. Broil for about 7-10 minutes or until browned.

Immediately place peppers in a plastic bag and tie the bag. Allow them to steam for 5 minutes, then peel off their outer layer of skin.

Add the peppers, tomatillos, and cilantro to a blender and puree.

Add the mixture to the pot with the pork and cook everything together for an additional 30 to 45 minutes.

Serve with tortillas, and a side of Mexican rice and beans.