Roast Leg of Lamb

Ingredients (13)

• 5 1/2 lb leg of lamb (bone in)
• salt
• black pepper
• 1 large onion
• 1 large orange
• 2 ribs celery
• 2 cups cut carrots
• 1 large head of garlic
• 3-4 fresh rosemary sprigs
• 4 cups beef broth
• 2 cups water
• 2 tbsp olive oil
• 1/4 cup flour