Why aren't they doing that?

After reading Bill McKibben's chapter on eating locally, I wondered about restaurants' websites regarding their food. Most restaurant chains and some local restaurants have menu lists of how many calories each item has, not to mention fat content, percent daily value, and other tidbits about their food. But why not tell where they got the food? You can ask the chef what time the salmon was flown in that day, but can you ask where they got that broccoli?

I think that restaurants (and grocers) should provide not just nutritional information about their menus, but harvesting/fishing/slaughtering locations of where they got the ingredients for those items. It's just as important--if not more so--to know that your eggplant came from down the road as it is to know that a breadstick has 180 calories. Especially in the midwest, when we have so much fresh produce at our fingertips three quarters of the year, should we be aware of where the food we eat comes from.