Imagine this: a long table nestled among olive trees, the sun setting over a dry, golden landscape, the scent of warm earth and wild herbs. A drizzle of olive oil falls onto freshly cut bread. Someone laughs. No one is in a hurry. If you've never experienced a late July afternoon in an olive grove in Trás-os-Montes and Alto Douro, there's a part of the Portuguese summer yet to be discovered.