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1
Sprinkle sazon seasoning over pork cubes and toss to coat evenly. Transfer to a large zip-top plastic bag. Mix orange juice, lemon juice, lime juice, cumin, paprika, chili powder, coriander, salt, and pepper together in a mixing bowl. Pour into plastic bag with pork; gently squeeze to evenly distribute marinade. Seal bag and place on a plate. Refrigerate 8 hours or overnight.
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2
Remove pork from marinade; reserve marinade. Heat oil in large skillet or Dutch oven over medium-high heat. Cook and stir pork until brown on all sides, 3 to 5 minutes. Add reserved marinade and enough chicken stock to barely cover the pork. Bring to a boil over high heat; cover, reduce heat to low and simmer 30 minutes. Remove lid and continue to simmer until meat is falling-apart tender, about 45 minutes.
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3
Transfer pork with a slotted spoon to a bowl; reserve 1/3 cup of cooking liquid. Cool pork slightly; shred pork with two forks. Mix in reserved cooking liquid, cilantro, and 7 ounces of crumbled queso fresco cheese.
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4
Bring a large pot of lightly salted water to a boil. Cook pasta shells in the boiling water, stirring occasionally until tender yet firm to the bite, about 13 minutes. Drain.
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5
Preheat oven to 350 degrees F (175 degrees C).
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6
Cover the bottom of a 9x13-inch baking dish with 2 cups of pasta sauce. Stuff shells with a spoonful of pork mixture and arrange in baking dish. Pour remaining pasta sauce evenly over stuffed shells and sprinkle with remaining crumbled queso fresco.
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7
Cover with aluminum foil and bake in preheated oven until hot and bubbly, about 30 minutes. Let stand 10 minutes before serving.
