WRITTEN BY WASHINGTONIAN STAFF | PUBLISHED ON JULY 17, 2017DC’s Little Ethiopia, around Ninth and U streets, boasts many tasty spots. But Alemayehu Abebe’s cooking offers a reason to stray a few blocks south. In a subterranean rowhouse dining room, the vegetarian deluxe platter features ten dishes including stellar classics (spicy lentils, garlicky tomatoes) and unusual finds, such as…