**If you’re in the U.S., I’d start with a small jar from [The Spice House](https://www.thespicehouse.com/products/sumac).** Its Turkish sumac is described as tart and lemony, with sour-cherry notes. It contains salt, so allow for that when seasoning.

Another promising option is [Burlap & Barrel’s Cured Sumac](https://www.burlapandbarrel.com/products/cured-sumac): Turkish sumac with 6% salt, described as bright and sour. Its page currently shows it as unavailable, though.

To get closest to what your friend gave you, **ask your friend—or a Persian restaurant whose sumac you enjoy—which brand or supplier they use.** That gives you a much better lead than another generic import-store purchase. If buying locally, ask whether you can taste a tiny pinch before purchasing; you’re looking for an immediately noticeable, fruity tartness.

What country or city are you shopping in? I can narrow this down to sources that ship to you or nearby shops.