Trim off any excess fat from the pork and cut it into 2-inch squares.
In a (6 quart) medium stockpot, over high heat, coat meat cubes with flour and sear the pork in the oil until golden brown.
Remove the pork from the pot and pour off any oil or fat drippings, but leave 2 tablespoons of oil
In the same pot, over medium heat, add the chopped onion, garlic, salt, and pepper and saute until transparent.
Add the cumin, pork, and chicken stock back to the stockpot and cook for 1/2 hour.
Add Chile Verde sauce to cover the pork in the pot completely, and cook an additional 1/2 hour on low heat.
Preheat oven to 425 degrees F
Line the baking sheet with aluminum foil or parchment paper.
Place the tomatillos, onion, and pepper on the baking sheet, drizzle with the olive oil and a generous pinch of salt and toss
Roast for 15 minutes or until the tomatillos are soft.
Add the roasted vegetables, lime juice, and cilantro into the blender and pulse.