Preheat the oven to 325℉. In a medium bowl, combine the Mojo Criollo, beer, Sazón, orange juice, garlic, and brown sugar. Pat the roast dry with paper towels and sprinkle with 2 teaspoons of the adobo seasoning. Place fat side up on a rack set in a 16x12-inch roasting pan.
Pour the beer mixture over the roast. Add rosemary and cover tightly with foil. Roast for 3 to 4 hours, or until the meat is very tender.
Increase the oven temperature to 400℉. Toss the potatoes with the carrots, oil, and remaining adobo seasoning. Add to the roasting pan, scattering everything around the pork. Roast, uncovered, for 50 to 60 minutes or until potatoes and carrots are tender and the top of the roast is crispy and golden brown.
Let stand for 10 minutes before slicing. Serve with potatoes and carrots. Drizzle pan juices over roast. Sprinkle with cilantro.