Few are the foods with such power over the imagination that just hearing their names can stop your stream of thoughts and send you off to the internet to look at restaurant menus. Take, for instance, Peking duck. The name alone is mouthwatering. And its scarcity recommends it, too: Very few Dallas-area restaurants serve true Peking duck. Little Kaiping is among them. Its duck is very subtly flavored — faint whispers of smoke and sugar add to the delicacy of the meat itself — and it’s not too fatty at all. The skin remains crisp, but not tooth-crackingly brittle. It’s not a flashy presentation, but it’s completely satisfying.