Chestnuts are a favourite Turkish street food in winter, sold from wood-fired braziers by hawkers who probably sell ice cream in the summer.
Bursa, a town near Istanbul, is famous for its chestnuts (and its Iskender kebap— see). It is in the foothills of Mount Uludağ, which has forests full of chestnut trees.
In this meze, I’ve paired the chestnuts with leeks, another winter ingredient. It involves a fair bit of folding, as you’re required to turn a tube into a triangle. Don’t get hung up on a perfect fold. Anything vaguely resembling a three-sided parcel will do, as long as you eat it quickly.