Even 14k is daylight robbery, who pays that?? I get 1kg of cuadril or bife de chorizo for less..What petrol station do you go to?
Tangrill Los Cardales (Ruta 9, @tangrillarg) has its burger at 14500 Pesos. Not too much in the way of ambience, but it's nice enough, has a Havanna shop too, and a space for working when power goes down elsewhere (big generator out the back). There are other Tangrills around the place, I believe.