Add wine and rosemary sprig to pan. Heat to boiling, stirring occasionally. Boil 5 minutes, stirring occasionally, until sauce is reduced to a little less than 1 cup. Remove from heat. Beat in butter, 1 piece at a time, with wire whisk, adding the next piece only after the first has been completely beaten in and melted. Stir in 1 teaspoon lemon juice, 1/4 teaspoon salt and 1/4 teaspoon pepper. Remove lemon quarters and garlic halves from cavity of chicken. Serve chicken with sauce.