Identify the type of potato used in Porto's famous rolls.

Porto's famous rolls are made using mashed potatoes. This choice is significant because the use of mashed potatoes in the dough contributes to the rolls' unique texture and flavor. Mashed potatoes provide moisture and richness, ensuring that the rolls remain soft and tender while maintaining a light and fluffy interior. This distinct preparation method has become a hallmark of Porto's culinary style, allowing their rolls to stand out in both taste and quality compared to rolls made with other types of potatoes. The incorporation of mashed potatoes is a key component that enhances the overall eating experience.