There are a lot of mini burgers in pintxo land, but this one is special.  It's called hamburguesa chicha, and it's made with fresh ground spiced pork meat, basically a chorizo burger. Perched on its artisan brioche. it is super juicy and brings to mind freshly packed pork sausage. 

Casa Urola
Fermin Calbeton Kalea, 20 (La Parte Vieja)
Closed Tuesdays
http://www.casaurolajatetxea.es
+34 943 44 13 71