How to Make It
Preheat the oven to 275°. Season the short ribs all over with salt. In a large enameled cast-iron casserole, heat 2 tablespoons of the oil until shimmering. In batches, cook the short ribs over moderately high heat, turning occasionally, until browned all over, about 8 minutes per batch. Transfer the ribs to a plate.
Spoon off the fat from the casserole. Add the stock, sherry, onion, leek, halved scallions, mirin, ginger, garlic, soy sauce, miso, sugar, star anise, cinnamon stick and mace; bring to a boil over high heat. Add the short ribs and the cherry bundle, cover and braise in the oven for about 2 hours, until the beef is tender.
Using tongs, transfer the short ribs and the cherry bundle to a plate. Strain the braising liquid through a fine sieve into a large heatproof bowl; discard the solids. Remove the cherries from the cheesecloth and transfer to a blender. Add 7 cups of the strained braising liquid and puree until smooth. Reserve the remaining braising liquid for another use.
Wipe out the casserole and heat the remaining 2 tablespoons of oil in it. Add the shallots and cook over moderate heat, stirring occasionally, until softened and browned, about 8 minutes. Add the braising puree and boil over high heat until reduced to 6 cups, about 10 minutes. Add the short ribs to the sauce, cover and cook over low heat until they are hot and tender, about 10 minutes.
Transfer the ribs and some of the sauce to bowls. Garnish with sliced scallions and serve.