Preheat oven to 350° F.
Combine thyme, rosemary, parsley, lemon zest, salt, and pepper.
Rub boneless leg of lamb with 4 T. olive oil, then cover with herb mixture. Place lamb, fat side up, on a rack in a roasting pan.
Add ½ cup wine and broth to the bottom of the roasting pan.
Place roasting pan in the oven. Cook uncovered for 1 hour and 30 minutes for rare 120-130°, 1 hour and 45 minutes for medium rare 130-140°, 2 hours for medium 150°, or until a kitchen thermometer registers desired temperature at the thickest part of the lamb.
Remove lamb from oven. Let rest tented with foil 10-15 minutes.
While lamb is resting pour pan drippings into a saucepan add remaining ½ cup white wine and reduce by half. Season to taste.
Remove netting from lamb, slice and serve with white wine reduction.