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I have wanted to build a solar oven for years, I've just never gotten around to it. Great for emergencies and not having to use the oven on a hot summer day. Here's one to maybe try, though some sites tell you to be sure all your supplies are non-toxic.
20 Wonderful Outdoor DIY projects
Cooking off the grid: Building a solar cooker. I pinned this thinking it was a good idea if i ever needed it but when I need the info i might not have access to view it. It does say off the grid as in power outage and no computer access. hmmm... I 'll pin anyways