Fair of la pera asadera de Acisa Activity · La Ercina, La Montaña de Riaño, León Image of La Ercina, not of the place itself. At the end of October Acisa de las Arrimadas devotes a fair to the pera asadera, a local variety hard and sharp when raw that is cooked in the oven or in syrup and that was a winter dessert throughout the mountains. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in La Ercina