Add onions to pot and sauté; over moderately high heat, stirring frequently, until pale golden, about 10 minutes. Add garlic, tomato paste, thyme, rosemary and remaining 1/2 teaspoon salt and 1/4 teaspoon pepper and cook, stirring, 2 minutes. Add wine and water and bring to a boil. Return beef to pot, then cover tightly and braise in oven, turning once after 1 hour, until beef is very tender, 2 1/2 to 3 hours total.