Black truffle of the Somontano Food and drink · Abiego, Somontano de Barbastro, Huesca The holm-oak scrub at the foot of the sierra de Guara yields winter black truffle from December to March, sought with a dog; it is used grated over eggs and potatoes or to flavor the comarca's oils and cured sausages. Photo: Diego Delso (CC BY-SA 3.0) What to see and do in Abiego