Vegetables of the Gelsa river plain Food and drink · Gelsa, Ribera Baja del Ebro, Zaragoza Image of Gelsa, not of the place itself. The huertas irrigated by channels of medieval origin in the meander of Gelsa produce onion, tomato, pepper, borage and cardoon. The production supplies the market of Zaragoza and sustains the domestic recipe book of boiled and battered vegetables. Photo: Ecelan (CC BY-SA 4.0) What to see and do in Gelsa