This is a picture of the Solar StoveTop.  The full-size pattern with instruction book guides you through building a reflective hot plate cooker using locally purchased supplies.  Simply cut out the pattern, trace onto cardboard, and assemble.  This cooker uses a circular curve rather than a parabolic curve, and a series of wedge-shaped pieces for the reflective surface rather than trying to mold a compound surface.  This makes for easier construction, and most importantly, results in a 6-inch hot spot instead of a pinpoint for better cooking and more even heat.  It will reach 650 degrees F within minutes and only weighs 3 pounds.  The cooker is capable of frying, boiling, steaming, poaching, and perking coffee.  Also includes recipes from StoveTop Pizza to Poached Salmon on a bed of Greens.  Very portable and efficient. You can also cook inside with sun coming through a window.