Photo: Wikimedia CommonsIllegal Burger has been quietly turning out some of Oslo best charcoal-grilled burgers from its little Mollergata home for years, long before the city caught burger fever. The menu is short and honest, the patties are handmade and juicy, and the crowd is a happy mix of students, workers and night owls. Keep it simple with the classic and a portion of fries, and expect a short wait at peak times because the kitchen is small.