[French Fries]

I'm wondering what is the proper way to heat up a pan before putting in the food. Let's say I want to sear a steak, pork chop or chicken breast.

• Is the technique different depending on the material? I use stainless steel and non-stick.

• Should you put the oil before you start heating up? Or once the pan is hot?

• If you put the oil in the hot pan, do you then wait for it to heat up?

• Should the heat be full on during the heating period?

• What if I use butter instead of oil (ie for eggs)? What if I mix oil and butter (ie for potatoes or steak)?

Thanks!