Poke holes in leg of lamb, stuff with garlic.

Add dressing to a large plastic bag, add lamb in.

Refrigerate overnight to let lamb marinate.

Preheat oven to 375 degrees.

In a heavy dutch oven, sear lamb on all sides (reserve the marinade in the bag to baste the lamb if it dries out).

Place in oven (if adding wine, add it to the dutch oven as lamb goes in).

Cook 1/2 hour for each pound of meat (around 2-3 hours for a 4-5 pound leg of lamb).