You burn a marshmallow when you put in it the fire, but you toast it when you let the heat from the fire cook it for you.

You toast a piece of bread by letting the radiant heat of your toaster over cook it, not by exposing it directly to a fire.

There are many ways to cook food, but if you want to toast something you must expose it to radiant heat and not the direct source of that heat.

Maria decided to toast some marshmallows by holding them over the bonfire we had made at the camp.

I like to toast bread in the toaster oven, but my mother uses it to toast cheese as well from time to time.