>Marsha Cohen wrote in the Bais-medrash digest:
>>...But I am curious as to why, if it is not okay to cook an egg in the sun
>>(i.e. you aren't turning the sun on and off, just utilizing its heat that
it >emits anyway), it is permitted to make cholent.
>Jewish law forbids cooking of *any* kind on shabbos, be it on an open fire,
>an oven, a radiator, the sun...
Cooking by direct sunlight is *permitted* on Shabbos. Cooking by indirect
sunlight, i.e. in hot water heated by the sun, is forbidden. See Shulchan
Aruch Orach Chaim Chapter 318:4
In fact the example given there of a permissible form of solar cooking is
in fact Marsha's case of cooking an egg in the sun!