Hi, where and when do you plan to open that persian restaurant? My husband is iranian and live in Warsaw, maybe he can help you. He is a great cook - its his hobby!!!
I don't know of any Iranian shops, but the Samira Restaurant (hard to find, at the back of the National Library) has a small shop section with Middle Eastern items, and the shop on Nowogrodzka (or is it Zurawia), just west of the junction with Krucza has some Pakistani things. The Turkish restaurant on ul. Zgoda (opposite Grill Bar Zgoda) has a 'retail shelf' with some Turkish products(I know it isn't the same, but maybe worth having a look).
Some friends speak highly of a restaurant called Sheesha Lounge, which isn't Persian, but has some Persian dishes on the menu.
Isn't Iranian restricted to people from Iran, while Persian to the ethnic group (much larger than the country of Iran, which by the way was called Persia for a long time)?
Yes, that is true. Persian is an ethnic classification, and not all Iranians are Persians. But in all honesty, I think people use the term Persian because it has a better connotation at the moment.
This story might be of interest. The Polish Post Office recently issued a stamp acknowledging the role Iran played in saving and caring for Polish refugees during WW2.