Step 1Heat the olive oil in a skillet. Add the onion and garlic and cook just until the onion is translucent.
Step 2Add the tomatillos, poblanos, jalapeno, cilantro, epazote leaves, oregano and chicken stock and simmer for 20 minutes.
Step 3Remove the sauce from the heat. Cool it slightly, then puree it in a blender.
Step 1Heat the oil in a large skillet. Add the pork and sear until lightly browned. Add 2 cups water and the salt and simmer until the pork is tender, about 30 minutes. The liquid will reduce to a few tablespoons. Remove from heat and set aside.
Step 2In a separate saucepan, bring 1 quart of water to a boil. Add the nopales and simmer for 10 minutes. Remove the nopales from the heat, drain and rinse with cold water. Combine the nopales and the poblano pieces and set aside.
Step 3Add the tomatillo sauce and the nopales mixture to the pan with the seared pork. Simmer for 10 minutes. Season with salt and pepper.