Food to give as a gift that is only representative of Poznan?

I'm going to a formal visit in warsaw ,and I would like to buy food that only poznan has and warsaw doesn't have .

Can anyone tell me what and where can I buy such a thing ?

I thought about Rogal świętomarciński ,but I don't think it's appropriate to present a paper bag with rogal as a gift .

I'm not sure you can find anything like it. There's a local cuisine, but it'll be difficult to find a product that is sold in Poznan and isn't available in Warsaw - both cities are too big and too close for that.

Greater Poland's cuisine is strongly based on potatos so you can consider the potato vodka - eg. Chopin vodka - it can be bought in Warsaw too but nevermind it.

there is this cake called BRZDĄC which is kind of unique for Poznan area and quite tasty

You can buy a nice gift box to put them in. They would be a great gift, but you have to make sure they are fresh, that is, buy them the morning you leave for Warsaw.