MakeHeat

If they could julienne the veggies, too…  Sun ovens are a great way to cook, provided the sun and clouds cooperate.  Many parts of the US can take advantage of this and save energy.  The downside is that it can be inconvenient – you can’t plan on the sun being out when you want it to be.  I’ve built a couple of these with varying results, what I really need is some better materials to build with, or buying one outright.

If you can trust your weathermanperson, you can create a whole lunch/dinner in these.  There are bake-offs, recipes and more online.  In case of a sudden downpour, you can always bring it inside and cook it the old fashioned way, too – with the microwave. 

Sun Powered Oven Bakes, Steams, Boils and Saves Money | Emaxhealth.

for the DIY’ers, see http://www.solarcooking.org/plans/