One of my finest childhood memories is something I experienced many times while tenting with my folks in Sequoia National Park, where the rivers are always icy. At home we never had any kind of dessert, but on camping trips my mother would often make up a batch of Jell-O in a screw-top canning jar. She'd then close it up tightly and set it in the river (in a net beg, weighted down with a rock). It'd be firm in just a few minutes, ready for hungry kiddies like me.

By the way, the river also chills beer to perfection -- and that would my camping dessert of choice these days.

C