What a great experience and view. We just walked in about 6pm and there were loads of tables, so no need to pre book a set drink/food package. Saw the city in evening light and after dark. There is a great choice of drinks, understandably pricy but our glass of wine and a cocktail (at 25 euros) with cheese and ham pin wheels and dish of assorted nuts, so no real need to order food.
Great experience to relax for an hour or so.