Cast-Iron
I heard a salesperson in a cooking store explain to a customer that "iron is a good conductor of heat." That’s true when compared to air or wood, but compared to copper or aluminum, it’s hardly a contender. While iron (cast or otherwise) does not take or conduct heat easily, it does retain it very well. Iron likes whatever temperature it is now and doesn’t easily change. It will eventually give-in and start heating up and, when it does, it's like a big thermal fly-wheel. This is where cast-iron wields its charm. If you get a thin stainless steel pan nice and hot, then throw a thick steak on it, it'll cool down almost instantly. There just isn't enough mass in the pan to fight back against that big, chilled chunk of protein. Perform the same task with a hefty cast-iron pan, and you'll find the steak will continue to sizzle as the pan gives up heat from its own reserves and takes on new heat from the flames ( or coils or magnets ) below. However, all of that p...