In saute pan, heat oil. Brown short ribs and onions; transfer to oven-proof casserole. Deglaze saute pan with wine; add wine, stock, soy sauce, sugar, garlic, star anise and ginger to casserole. Cover and braise in 300 degree oven until meat is falling off bones.
Remove short ribs; strain and degrease liquid. Simmer short ribs in liquid until liquid is reduced and flavorful. Add butter and simmer until incorporated. Garnish with chives and a small amount of wasabi paste.