Preparation Heat 2 tablespoons oil in large skillet over medium-high heat. Add 2 minced garlic cloves, 2 teaspoons rosemary, and 1/2 teaspoon orange peel; stir 30 seconds. Add artichoke hearts and broth; bring to boil. Cover; boil 5 minutes. Uncover; cook until sauce thickens, stirring occasionally, about 4 minutes. Remove from heat. Sprinkle lamb with remaining garlic and rosemary, then salt and pepper. Heat remaining oil in another large skillet over medium-high heat. Add lamb; sauté until cooked to desired doneness, about 4 minutes per side for medium-rare. Transfer lamb to platter. Spoon off fat from skillet with lamb. Add artichoke mixture; boil 2 minutes, scraping up browned bits. Season with salt and pepper. Spoon artichoke mixture around lamb. Sprinkle with remaining orange peel and serve.
Preparation Heat 2 tablespoons oil in large skillet over medium-high heat. Add 2 minced garlic cloves, 2 teaspoons rosemary, and 1/2 teaspoon orange peel; stir 30 seconds. Add artichoke hearts and broth; bring to boil. Cover; boil 5 minutes. Uncover; cook until sauce thickens, stirring occasionally, about 4 minutes. Remove from heat. Sprinkle lamb with remaining garlic and rosemary, then salt and pepper. Heat remaining oil in another large skillet over medium-high heat. Add lamb; sauté until cooked to desired doneness, about 4 minutes per side for medium-rare. Transfer lamb to platter. Spoon off fat from skillet with lamb. Add artichoke mixture; boil 2 minutes, scraping up browned bits. Season with salt and pepper. Spoon artichoke mixture around lamb. Sprinkle with remaining orange peel and serve.