What a great idea...sell french fries, and only french fries. Use a variety of sauces to add…read moreflavor (and to set yourself apart from your local hamburger joint), and keep the prices dirt cheap.
A fun place to grab a snack...people sitting around on the sidewalk on empty milk crates, talking and laughing, and eating delicious fries. It's busy on weekend evenings, but worth waiting in line for a large fry with samurai sauce (for only 8 PLN).
Now, if only someone in Warsaw would take the same idea and open a restaurant featuring only chicken wings with lots of sauce choices...