The All-Clad D3 Stainless 12" Fry Pan with Lid, about $120, has been the test kitchen’s winning large stainless-steel skillet for more than a decade. We recently reviewed the 10-inch version and found it just as capable. Both pans are fully clad, or made from three metal layers—aluminum sandwiched between layers of stainless steel, which gives them the speedy heat conduction of alum...