With sharp paring knife, cut a deep slit into leg. You don’t want to make your cuts too wide…just wide enough to incorporate a garlic clove. Cut just enough slits for your garlic cloves to be inserted.
When cloves are all inserted, place leg in Dutch oven.
Drizzle some oil over the lamb and sprinkle with salt and pepper.
Pull the “needles” off the rosemary sprig and sprinkle on top.
Cook for an hour with lid on. See notes for cooking time ranges and be sure not to overcook.
When done to your liking, remove from oven and let rest on cutting board for 10-15 minutes before slicing.
You can make gravy from the drippings if you like.
Notes
Cook about 15 minutes per pound of meat.
Aim for a half pound raw weight per person.
Remove from oven at 130-135°F on an instant-read thermometer.