Heat the oil in a flameproof casserole or dutch oven, and brown the lamb in batches over medium-high heat. Return all the lamb to the pot, and sprinkle it with the flour and sugar. Cook, stirring, until absorbed, about 2 minutes.
Add the stock, wine, tomato paste, rosemary, and garlic. Stir well, and bring to a boil. Reduce the heat, cover, and simmer until the