San Pietro boasts a rugged, wild landscape, with a picturesque coastline, a palette of colors, and the scents of Mediterranean brushwood. The winery, Tanca Gioia, is unique to the island, founded in 2000 by a courageous duo of friends who took an interest in the land, its promising climate, and volcanic soil.

They grow indigenous grapes: Vermentino di Sardegna, Carignano, Bovale (Bovaleddu), Moscato Calasetta, and Nasco Aromatic. The vines are cultivated with minimal human intervention, traditional treatments, and no irrigation. Each vintage is peculiar, giving an appreciative wink to the moist, salty wilds, full sun, and sandy soil, in which wines are made in the vineyard. During vinification, they work to preserve the aromas, elegance, and character of the wines rather than manipulate them. All their wines live and evolve in steel and glass; they do not use oak.

With the unusual name of "U-Tabarka," which they, in a way, subtitled the winery, Tanca Gioia pays homage to their land. This name is taken from the small Tunisian village of Tabarka, where a small colony of Genoese coral fishermen settled in the late 11th century. In 1738, when the coral was exhausted, the colony returned to mainland Italy. Along the route back to the mainland, they encountered plenty of coral in the waters off the southwest coast of Sardinia. This uninhabited island became their home. To this day, Carloforte maintains strong cultural ties with the mainland towns of Pegli and Genova: the population still speaks a variety of Ligurian language called tabarchìn (or tabarchino, in Italian), separate from both Italian and Sardinian, which is used even by most children and taught in the island's schools.