A technical report published in Agroportal reveals that olive oil production costs in Portugal range from €2.5 to over €12 per litre. The traditional dryland groves of Trás-os-Montes are the most expensive to run — and the least supported. Here's what that means for producers, buyers and visitors.

The Polytechnic Institute of Bragança (IPB) is running "Ano D'Alimentação", a series of events on valuing Trás-os-Montes food products. On June 17, in Carrazeda de Ansiães, olive oil takes centre stage — with technical visits, talks and a free tasting.