How to Make It
Bring a large pot of water to a boil. Score the underside of the ribs, making 4 long, deep slits across the backs of the bones. Cut each rack in half and season with salt and pepper. Add the ribs to the boiling water and simmer over moderately low heat until tender, about 1 hour. Transfer the ribs to a rack set over a rimmed baking sheet and let cool, then refrigerate uncovered for at least 4 hours or overnight. Cut the racks into individual ribs and bring to room temperature.
In a medium bowl, combine the hoisin, chile-garlic sauce, oyster sauce, orange juice, black bean sauce and Sriracha. Transfer the glaze to a wide, shallow dish.
Preheat the oven to 200. In a large, deep skillet, heat 2 1/2 inches of oil to 350. Working in batches, fry the ribs until nicely browned and crisp, 3 minutes. Add the fried ribs to the glaze and turn to coat. Transfer the glazed ribs to a baking sheet and keep warm in the oven while you fry and glaze the remaining ribs. Transfer the ribs to a platter, garnish with the scallions and sesame seeds and serve.