Near the Galata bridge, there are stalls that sell simple food. The speciality is a sort of sandwich. A mackerel fillet, fresh off the grill, between hunks of fresh bread, with lots of parsely, raw onion, and sumac.
I love mackerel, and my favourite thing is to frazzle them on the grill, with rosemary, and serve them more or less as they come, with lots of lemon to cut the grease. But the combination of serious quantities of flat leaf parsely, the sharpness of raw onion, and the glorious citrusy flavour of sumac...
Oh yes, I'm a convert. It's the parsely/onion/sumac/olive oil thing. Add some cracked pepper, or chilli flakes (the Turkish sort) and you have something that sort of shakes your guts around (in the emotional sense)
You never forget these flavours.
I will have to practice my filleting skills. For me, it is all second hand. The recipe comes from a friend. Her apartment looks over the Bosphorus, and her life is a wonderful collision between east and west.
Turkish cuisine is incredible. I really don't care if tomorrow morning my flat smells of fish. I am well fed, and feeling gloriously transported to another very sunny place.