Season steaks with salt. Press pepper on surfaces.

Heat oil in large heavy skillet over high heat. Add steaks. Lower heat to medium; cook, turning once, 4 minutes per side for rare, 6 minutes per side for medium-rare, and 8 minutes per side for well-done. Remove to warm platter; keep warm.

Add onion to skillet; cook until browned, stirring, 2 minutes. Add half the rosemary, half the garlic and cook, stirring, 20 seconds. Add wine. Increase heat to high; boil vigorously 2 minutes. Add broth, sugar and meat juices that have collected on platter. Boil 10 minutes more or until liquid is reduced by half, about 1 cup. Add remaining rosemary and garlic. Pour over steaks and serve.