If there is one thing that you can find wherever you go in the Middle East - Jerusalem, Gaza, Beirut or Cairo - it is hummus, that mashed-up festival of chickpeas, olive oil, sesame paste, lemon juice and garlic. It should be touching - a food that unites. But the Middle East is a place where passions are quick to ignite. And so, where there is hummus, there is also intense rivalry - over who has the best recipe, over who invented it, and over who can make the biggest bowl of it. Last year, Israeli chefs came up with...