In 1830 a new element that would become a symbol of the Plaça Nova was added to the Feast of San Roc and, as a tradition of the Feast, has endured to this day: the Porró llarg. This "porró" (glass wine jar with a long tapered drinking spout) was brought from Mataró, on foot so it wouldn't break, or so goes the story, by the neighbor Caterina de Morató when, in 1830, she was in the capital of Maresme and, while visiting a glass factory, commissioned a unique and singular piece for the celebration of the Feast of Sant Roc of Barcelona.

The "porró", renowned in the neighborhood and known for its size as Porró Llarg (long) is made of a very thin and clear glass with fine white stripes following a spiral; its spout has a length of seventy-five centimeters, which makes it difficult to drink from and, even today, is a major attraction of the feast. The Porró Llarg can only be drunk from on the day of Sant Roc when, after the courtship, it appears and stays all day in the Plaça Nova so that anyone that can lift the long spout may drink from it.