Gather all ingredients before starting recipe.
Pre heat oven to 325°F.
Peel and slice onion.
Remove seeds and ribs from Pablano peppers and slice peppers into 1" rings.
Zest and juice 1 large orange.
Heat oil in a large skillet over medium high heat, add cubed pork, season well with kosher salt and black pepper, and sear in batches.
Remove pork and set aside. Add onion and pepper to skillet and stir to combine. Sauté until softened, about 3-4 minutes.
Add oregano, cumin, chili powder and garlic and continue to stir until the garlic becomes fragrant, about 1 minute.
Add orange zest, juice and chicken stock then return the pork and any juices from the plate to the pan. Stir to combine. Bring to a fast simmer, then reduce heat to medium low, cover with a lid or cover tightly with aluminum foil.
Place covered pan in a 325 °F pre heated oven and braise for 1.5 to 2 hours or until the meat can be shredded with a fork.
Move the meat to a baking sheet, reserving juices, and shred the meat with a fork.
For Qeuso sauce, cube Monteray Jack cheese and add cheese and canned tomato and chili to a small sauce pan and heat on medium low heat. Stir occasionally to combine cheese with the tomatoes.
Pre heat the broiler and place the shredded pork under the broiler for a few minutes, make sure that you keep and eye on the meat so that it does not burn.