Guests and staff evacuated a restaurant on Madison's West Side Thursday night after a fire started on the kitchen's stove top, the Madison Fire Department said. The fire at the Denny's, 433 South Gammon Road, started around 6 p.m., Fire Department spokeswoman Cynthia Schuster said in a statement, and the firefighters arrived to see black smoke coming from the rooftop exhaust. An assistant manager told firefighters on the scene that he used an extinguisher to try to put out the fire, Schuster said, but some flames still burned when the firefighters entered the kitchen.