Before cooking a meal in your oven you tend to read the instructions. For example: the instructions tell you to preheat the oven to 350 and then place your food in it for 15 minutes. Why do you have to preheat again? If you place the food in the oven before preheating it, the only difference is having a longer wait period. But you're waiting that time anyway for the oven to preheat. And you actually might save time in cooking your food because you put it in the oven early. Who made up this silly idea of pre heating, and why do we do it?
