At Rosie McCann's Irish Pub & Restaurant, an upscale tavern in San Jose, Calif., patrons frequently request Stella Artois, a Belgian lager whose origins go back to the 14th century. But for nearly all of last month the Stella tap was dry. "People were frustrated," says bartender Fee Bakhtiar. "We'd say, 'Oops, we're out. There's a nationwide shortage.' It was embarrassing."

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