At the Haverhill campus of Cedar's Foods, it's all about the chickpea. An annual 20 million pounds of the tiny 6-millimeter bean produces 5 million containers of hummus a week. That's a lot of hummus for a company barely 40 years old. At Island Creek Oyster Farm in Duxbury, caviar is the new obsession. Before you say too elite and too expensive, remember that was the cry before oysters showed up on every menu.