6 foods you should never, ever cook in a cast-iron skillet

A cast iron skillet is a beautiful—albeit tricky—thing. Fail to season it properly or use the wrong ingredients and you'll end up with a rusty, crunchy mess. But treat it nicely (with lots of oil) and it'll be oh-so-good to you. (Think: one pan for the rest of your life.) Here, six foods to avoid so that you and your pan can live happily ever after.