Rosemary is primarily used for cooking, and is an important spice. It is believed to go well with lamb. Usually, lamb has slits made in it, into which the sprigs of the Rosemary are tucked in. Also, larger sprigs of this plant are used when you grill lamb.
Rosemary is also used in soups, but it has to be used to a lesser extent to flavor soups. This is because it is actually mixed in the liquid, which magnifies the effects of the spice.