As is usual for San Sebastian/Donostia you'll eat small dishes called Pintxos. The cold pintxos are on display on the bar and you can order hot pintxos from the menu.
Go for pintxos with a glass of wine, you really can't go wrong with any of them. The value for money in Mendaur Berria really is through the roof. For 2-3 dollars each you can sample Michelin-star quality food and another 2 dollars/euros for a decent glass of wine. Try the Cod Taco.. Heaven!