Place the leg of lamb in an oven pan.
Rub the lamb first with wine and then with olive oil.
Sprinkle the lamb with a good dose of salt and pepper (as desired).
Sprinkle fresh rosemary on the lamb.
Place the sliced onion, the chopped garlic, parsley and the bay leaves in the pan all around the lamb.
Add 1 cup of water to the bottom of the pan.
Cover the pan with aluminum foil and cook in the oven for 1 1/2 hours at 375F.
Remove the aluminum foil and cook for an additional 1/2 hour or until colored to your liking.