By Korsha Wilson, The New York Times The menu at Lapis, an Afghan restaurant in the Adams Morgan neighborhood of Washington, D.C., offers tongue-in-cheek introductions to each section. The soups are “guaranteed to win over your Afghan mother-in-law (or find you one),” the signature dishes are “as formidable as Afghanistan’s mighty mountain ranges.” And the Afghan dumplings are presented with a simple phrase: “Yes, they exist.” Among the aushak and mantoo (sometimes spelled mantu), the most popular dumpling is a comforting shrimp-filled version in a saffron cream sauce.