There was a frost expected here two weeks ago, but Gary Nabhan of Taco Diplomacy a conservation biologist and inveterate seed-saver, was out in his hardscrabble garden anyway, planting his favorite food, hot chilies.  Chiltepin, chile de arbol, Tabasco, serrano, pasilla, Chimayo.  These are only a few of the pungent peppers that Mr. Nabhan and two other chili lovers, Kurt Michael Friese, a chef from Iowa City, and Kraig Kraft, an agro-ecologist studying the origin of hot peppers, collected on a journey that began two years ago in northern Mexico, and took them across the hot spots of this country…

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