Rack of lamb in a mustard crust was one of the first dishes I learned to make at cooking school in Paris. It’s certainly one of the easiest: All you do is paint the lamb with mustard, dredge it in bread crumbs, and roast it in the oven. Now, I’m of the school of thought that if something tastes great baked, it most likely tastes even better grilled. So one day, I decided to try cooking this French classic on the grill. The French never knew what they were missing.