Adjust 1 oven rack to lower-middle position and second rack 6 inches from broiler element. Heat to broil. Line a rimmed baking sheet with foil.
Place tomatillos, poblanos, onion, garlic, and jalapeño on prepared sheet and drizzle with vegetable oil. Arrange chiles skin side up and broil until chile skins are blackened and vegetables begin to soften, about 10 to 13 minutes, rotating sheet halfway through broiling.
12 Tomatillos, 4 Poblano Chiles, 1 Large Red Onion, 7 Garlic Cloves, 1 Jalapeño, 1 Tablespoon Vegetable Oil
Transfer poblanos, jalapeño, and garlic to cutting board to cool a little. Turn off broiler.
Transfer tomatillos, onion, and any accumulated juices to a blender. When poblanos, jalapeño, and garlic are cool enough to handle, remove and discard skins and add poblanos, jalapeño, garlic and cilantro to the blender. Add the orange juice and pulse the blender until everything is pureed.
1/2 Cup Cilantro, 1/2 Cup Orange Juice, 1 teaspoon Pepper
For the Pork
Toss the pork pieces with 5 teaspoons salt in a large bowl. Cover and refrigerate for 1 hour.
4 Pounds Boneless pork butt roast, 6 teaspoons Kosher Salt
Meanwhile, chop the bacon coarse. Add any fat trimmings and 1/2 the bacon to a dutch oven and add the chicken broth and water. Bring to simmer over high heat. Cook, adjusting heat to maintain vigorous simmer and stirring occasionally, until all liquid evaporates and trimmings begin to sizzle, about 12 minutes.
6 Pieces Bacon, 1/2 Cup Chicken Broth, 1/2 Cup Water
Add the remaining bacon. Continue to cook, stirring frequently, until dark fond forms on bottom of pot and trimmings have browned and crisped, about 6 minutes longer.
Using slotted spoon, discard trimmings, and place bacon on a plate. Pour off all but 2 tablespoons fat; set aside pot. Heat the oven to 325.
Move one of your oven racks to the lower middle position and the other rack 6 inches from the top. Line a baking sheet with foil. Now listen, this can totally be done days in advance, in fact I often double it and freeze half for later using my Food Saver.
Heat reserved fat in Dutch oven over medium heat until shimmering. Add the oregano, cumin, cinnamon, and cloves and cook, stirring constantly, until fragrant, about 30 seconds. Add the chicken and brown in batches then pile it all back in the pot along with any juices.