This is a follow-up question to 18 minute matzah cutoff (and see also Where does the notion that the *entire* matza process must be done in under 18 minutes come from?)
I know this isn't the standard method of making matzah these days. But now I'm asking a practical question: Is there anything wrong with making matzah in home in your regular oven? Here's one description of what I've tried, how it would look:
- First run my oven on self-cleaning cycle, which seems to be acceptable to prepare it for (regular) Pesach use, according to the Star-K and perhaps others.
- My oven goes up to 550 F (288 C). (Igros Moshe (OH 153) says that the cooking surface needs to be ליבון קל, which is < 500 F which burns paper, and that the cooking device should surround the matzah, not just be on the bottom. The oven seems to meet those requirements.)
- Take out the bottom grate inside to make room. Preheat it to that temperature. Put a wide (18") piece of tinfoil on the bottom of the oven so that it is hot already when the matzah goes in.
- Take shemurah matzah flour and מים שלנו. (Of course, when I'm practicing it's with (probably chametz) flour off the shelf and water from the sink.)
- Knead one single cup of flour and around 5 tbsp water, quick as I can, roll it out with a clean rolling pin.
- Use a fork to make holes in the matzah (there are better faster tools available).
- Put it on another piece of tinfoil to help carry it, and put that on top of the hot tinfoil in the oven. (The poskim discuss baking matzah on paper which will burn up, and say that the paper not being hot won't matter, it's too thin and too quick. I assume the same is true of tinfoil.) It is now doubly separated from the oven floor in case something goes wrong. [Addendum - they allow paper b'dieved for that reason, but don't seem to allow it lechatchilah.]
- At this point around 10 minutes have passed, since I'm not so competent.
- It now takes around 10 minutes to bake. See the linked discussion above that that time should not matter.
- Pull the matzah out using the tinfoil.
- Clean everything thoroughly. Add new tinfoil in oven if you want to make another matzah.
Is this lechatchilah, b'dieved, or no good at all?