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Clean and trim the ribs of any silverskin and excess fat. In a small bowl, mix together Lee Kum Kee Hoisin Sauce and the ketchup.
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Place the ribs on a double layer of foil. Use half of the hoisin mixture and rub all over the ribs, meat side and bone side. Wrap up and refrigerate at least 3 hours or overnight.
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Preheat oven to 300°F. Place the foil wrapped ribs bone side up on a baking sheet. Bake for 3 hours until 1" of bone is exposed from the cooked edges. Flip and cook another 30 minutes, uncovered. Remove and let rest.
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When ready to serve, set oven to broil. Brush the remaining sauce over the ribs and broil bone side down until bubbly and slightly caramelized, about 4 minutes. Sprinkle with sesame seeds and sliced green onions. Serve.