Trim lamb of fat and cut into 1-inch pieces. Brown lamb in butter and oil. Add onions and shallots. Add broth, wine, and Madeira. Bring to a boil. Remove from heat. Add parsley sprigs, bay leaves, thyme, salt, sugar, and pepper. Cover and put into a 325-degree oven. Braise 1¼ hours. Check liquids. If reduced too much, add ½