Any ideas on building parabolic solar ovens, please?

Question: This is for a pre-cal project, we just finished a unit on graphing parabolas. Does anyone have any ideas/suggestions on how to make a parabolic solar oven (materials, focal length vertex measurements, etc...). Any information is appreciated.

Other people have asked this question and a lot of people have suggested http://solarcooking.org/, which I've already checked out. Other helpful sites would be appreciated. Thanks.

Answer:
My town did that. You just need bricks some wood(or anything that is flat and gets hot) food and of course the Sun!

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