We had tried quite a few pastéis de nata this trip, but Castro might take the crown. An elegant atelier with terrazzo floors and golden trims, Castro lets you watch the bakers in action - each tart carefully blistered and flaky to perfection. Paired with a creamy espresso, it made for the ideal pitstop. We sat at the counter, had our pastries, and watched life unfold on the Porto streets. Slow, sweet, and unforgettable.