In 1939, Don Ignacio Rodríguez Soto realized that modern housewives did not want to continue to make the time-consuming homemade recipe of Dulce de Leche, and were demanding a product they could buy at their grocer's. Don Ignacio set up Establecimientos San Ignacio S.A. near his hometown of Rosario, in the Province of Santa Fe, right in the middle of the dairy region of Argentina.

His company has grown since then and now the state-of-the-art plant in Sauce Viejo produces 12,000 tons a day of Dulce de Leche. San Ignacio is the third largest Dulce de Leche producer in Argentina and the largest producer of Dulce de Leche for industrial use. San Ignacio is the world's largest supplier of Dulce de Leche for the confectionery sector, satisfying the requirements of demanding customers such as Arcor, Wal-Mart, Kibon (Brasil) and McDonald's amongst other.

A exceptional product and manufacturing practices complying with EU health and safety standards allowed San Ignacio to export Dulce de Leche for the first time in 1978 to Germany. In 2002, it has selected Building Bridges (UK) Ltd. as the importer and distributor of its Dulce de Leche range.