Ziaulhaq Ahmadi sits on the floor of his small, one-story house, a brown, mud-walled compound at the end of a dusty alley in Aqa Saray. Surrounded by vineyards, fruit trees, and snow-capped mountains, the village is a half hour’s drive north of Kabul, Afghanistan’s capital. With great gentleness, he taps on what looks like a sealed mud bowl until it cracks open. Ahmadi, 45, reveals a handful of grapes from inside the mud container. They have been there, he explains, since harvest time, nearly five months ago, and kept for…