Smen is Morocco's funky fermented butter that lasts for years! Morocco doesn't have much of a dairy tradition, but there's one exception that dates back centuries: It's called smen, and it's a stinky, fermented butter made from sheep, goat, or cow milk. Tucked away in the heart of the Fez medina, there's a whole square dedicated to smen. Walk-in, and you immediately get a strong whiff of butter. Vendors in Qaat Smen, or Smen Square, are part of families who have been making it for centuries. More recently, they've added honey, olive oil, and khliyah — a rich, flavorful dried meat…