Do you know where your food comes from? Do you want to know? Truth be told, we all could stand to be more inquisitive about the provenance of the stuff that ends up on our plate. The best most of us do on a typical trip to Gristedes or Trader Joe's is to check the expiration date on a tub of yogurt; or, while perusing the menu at our neighborhood bistro, sheepishly ask the waiter where the shrimp is from or if the salmon is wild, at which point he or she will feign great interest and say, "You know, that is a very good