I have a friend who uses a homemade version to bake during the summer, so she doesn't have to heat up her house. She also happens to be a generous gal, so I've been fortunate to sample baked beans, chocolate cake, homemade bread, and roast meats from her solar oven.
She also uses a big cooler, with an old blanket or sleeping bag inside for extra insulation. She prepares whatever she wants to cook in a can or big jar with a watertight lid, or just seals the dish in a big plastic bag. Then she heats a big kettle of water to boiling, and places the sealed food in the kettle with a tight lid. She carefully sets the kettle in the cooler and wraps the sleeping bag around it to insulate. Shut the lid on the cooler, leave it alone for several hours, and come back to hot baked bread or casserole or beans or whatever. It works!
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