The plot from what I can remember was a bunch of young people buy a old gas station and turn it into a burger joint.. . they were looking to create a special sauce and created some type of sauce that made people hook up.. . the rival competition was trying to find out why they were selling so many burgers because he was trying to buy that location

Fast Food (1989) (http://us.imdb.com/title/tt0097335/)

Could be "good burger"

Fast Food (1989) (http://us.imdb.com/title/tt0097335/)

Thanks... forgot all about this movie! Couldn't give you a greenie.

Fast food
Year 1989