It is a simple idea. Use the sun beams to generate heat and cook food or boil water with it. In Oslo at the Sail Off Ceremony we served cooked carrots. Worked perfectly fine. Today was the day we tried to cook scrambled eggs...
We got our scrambled eggs fairly scrambled alright, and they tasted GREAT! Knowing we used nothing to get them cooked feels like a extra tasty add-on. However, floating liquids is perhaps not the best to cook in a tube if you sit on a moving vessel...or decide to move the oven while coocking.
We also boiled our morning coffee/tea water in a smaller version of the sun cooker.
Next time we will cook dinner – and create a more detailed test.