When I wrote my Lebanese cookbook more than 20 years ago, sumac was still a relatively unknown ingredient, unlike now when almost everyone knows what it is, and more to the point can find it fairly easily. Anyhow, my mother told me all about how it is picked and dried, and then ground and I put all the information in the book together with how if you picked it from the wrong plant, you could die. Thank goodness for my mother being the fount of knowledge on all things culinary in Lebanon because I had never seen sumac either on the plant, or being dried and until recently, I only knew it in its ground form. But one day, a few years back, I was walking through souk el-Attarine in Aleppo and I found stalls selling sumac on the branch (‘ala al-‘anqoud as it is described in Arabic) and whole berries after they have been rubbed off the branch; and one guy was selling it ground with the seed and ground without — I honestly could not tell the difference. And two years ago, I found it being sold on the branch driving through the south of Lebanon . However, it is only two days ago, that I finally saw the whole process.