Vegetables of the Jalón river plain Food and drink · Grisén, Ribera Alta del Ebro, Zaragoza Image of Grisén, not of the place itself. The huertas irrigated by the Jalón and the Ebro produce onion, tomato, pepper, potato and chickpea, the basis of the domestic recipe book of the comarca. A good part of the production goes to the central market of Zaragoza and to the canneries of the valley. Photo: Millars (CC BY-SA 4.0) What to see and do in Grisén