Heat oven to 425 degrees.
In a medium bowl, combine the salt, pepper, fresh parsley, fresh thyme, fresh rosemary, Herbes de Provence, ground sage, coriander, garlic, lemon zest and olive oil.
Stir.
Trim the excess fat from the lamb.
Poke holes on both sides of the lamb roast.
Massage the rub mixture into both sides of the lamb.
Allow the rub to infuse into the meat for at least 30 minutes.
In a deep roasting pan, combine the water, beef broth, and white wine.
Stir to dissolve the bouillon.
Add the onion wedges. Space the wedges evenly over the bottom of the pan.
Place the roast on top of the onions.
Cover tightly with aluminum foil.
Roast at 425 degrees for 15 minutes.
Reduce the heat to 300 degrees.
Insert the probe of a meat thermometer into the thickest part of the meat.
Roast the meat until the thermometer reaches the desired temperature: 135 -140 degrees for rare, 145 - 150 degrees for medium or 185 - 200 degrees for well done. If you want to shred the meat, well-done is what you want, which will take about 3 hours. For slightly rare, aim for the upper end of the rare range, about 1 hour and 15 minutes.
Let the meat rest for 15 minutes before carving.
Slice the meat against the grain. Ladle the broth and onions over the lamb on a serving platter.
Sprinkle with fresh parsley to garnish.