An unpopular opinion is what this is. What would be classified as 'extra messing' in the military, should be added up front to the price of the meal, not by per portion. The punter pays always, but it's about optics. Soon there will be items on the bill saying cover charge, plate charge, cutlery charge, electric charge, portion of rent, Labour charge... The list is endless. Factor it all in to the bill without detailing it, and the punter will pay. It's the extras that piss people off. Same for tipping. Add 20% to the price of the meal, make sure staff are paid a reasonable wage and let people choose to tip.