How to Make It
In a medium bowl, whisk the sake with the black beans, soy sauce, hoisin, oyster sauce and 1 cup of water. Let stand for 15 minutes.
Meanwhile, in a large enameled, cast-iron casserole, heat the oil until shimmering. Add half of the ribs at a time and cook over moderately high heat, turning a few times, until browned, about 5 minutes. Transfer the ribs to a platter.
Add the chiles, garlic and cut scallions to the casserole and cook over moderately high heat until fragrant. Add the sake mixture and bring to a simmer, then add the ribs. Cover and simmer over moderately low heat, turning occasionally, until the ribs are tender, about 1 hour.
Uncover the casserole and simmer over moderate heat until the sauce has thickened slightly, about 10 minutes. Transfer the ribs to a platter. Pour the sauce into a heatproof measuring cup and skim off the fat. Sprinkle the ribs with the sliced scallions and cilantro and serve, passing the sauce at the table.
The cooked ribs can be refrigerated in their braising liquid overnight.
Chinese fermented black beans are available at Asian markets.