Oven preheating - words from an expert
I really like following Dorie Greenspan and her blog. She is absolutely delightful IMHO. Anyway, I thought this was particularly informative and worth sharing with you all....
Preheating Your Oven: Count to 3 and Be Patient
March 08, 2012
IÃ¢ÂÂve always had an inkling that when the oven light turned off, telling you that the oven had reached the temperature youÃ¢ÂÂd set it to, you werenÃ¢ÂÂt supposed to slide your cake in immediately. But I couldnÃ¢ÂÂt tell you why I was inkled or even what it was that had me inkling. It just didnÃ¢ÂÂt feel right and so I always waited awhile.
Yesterday, I not only learned that my hunch was right, I learned why. And I learned it from experts, the Viking crew that had come to tune-up my range.
Mr. RepairMan explained that ovens cycle on and off to maintain an average temperature. I knew this. And that some ovens cycle further up and down from the desired temperature than others. And that some cycle more frequently than others. I knew this too. I also dreaded it because, as a cookbook author, I knew that every time I wrote a baking recipe I was jumping into the danger zone. With so many variables going into maintaining an even temperature, how could I be sure that your cookies would bake in the same 10-to-13-minute range as mine.
In fact Ã¯Â¿Â½Ã¯Â¿Â½" and I digress here Ã¯Â¿Â½Ã¯Â¿Â½" thatÃ¢ÂÂs why cookbook authors give time ranges. ItÃ¢ÂÂs also why we give visual clues like: bake until a knife inserted in the center of the cake comes out clean; or until the muffin is springy to the touch; or until the cookies are dark brown around the edges and pale golden in the center.
ItÃ¢ÂÂs also why I always urge you to get to know your ovens and, most important, to learn to trust your own good judgment.
Back to the oven and the tune-up. Mr. RepairMan said that when the oven light goes off for the first time, the oven is hotter than the temperature itÃ¢ÂÂs set to. For example, he explained that my oven swings plus/minus about 25 degrees F. So, if I set it for 350F, it might go up to 375F and then, when it dips down to 325F, itÃ¢ÂÂll heat again and go back to about 375F, keeping the average at 350F. But when it first preheats, itÃ¢ÂÂll go as high as 400F. According to Mr. RepairMan, the oven hits its stride and keeps the most consistent temperature after it has cycled on and off three times.
In practical terms, this means: Be Patient!
When you start to gather your ingredients together and measure them out for your mise en place, thatÃ¢ÂÂs the time to turn your oven on.
Writing this, IÃ¢ÂÂm remembering that Ã¢ÂÂin the old days,Ã¢ÂÂ recipes used to say things like: Ã¢ÂÂPreheat the oven for 20 minutes.Ã¢ÂÂ I havenÃ¢ÂÂt seen that in ages, but I think that if Mr. RepairMan had a say, every recipe would start that way again.
Here is a link that might be useful: Dories blog