It is a truth universally acknowledged that if there is an Ethiopian restaurant in a city, it will be called "Blue Nile." Houston, no stranger to universal truths, has its very own Blue Nile, tucked away in a strip mall on Richmond on the west side of town. Our Blue Nile has long been an outpost of exotic Eritrean and Ethiopian food, despite the fact that most Houstonians are blithely oblivious to its existence. And......