Possible Clues:

• Vegetable for Thanksgiving dinner
• Something to eat some time back
• It features in many American dishes
• Enough food for one month back there
• May be a foreign potato
• It takes one up to a month to eat one
• Put it up for a month if you're going to eat it
• Something to teat a month back
• One month back this might for the present have been edible
• One month back one could make a meal of it