Most likely hamburger, as hamburgers are not traditional Spanish foods. Also, tortillas originated from Mexico and pinatas from Spain (most likely), and sauce is such a generic type of thick liquid that every country has, so that it could have no way originated just from the Spanish language.
The famous palace built by King Philip II in Madrid is 'El Escorial' in the town of San Lorenzo de El Escorial. It was built in the 16th century. It is the historical residence of the king of Spain, which is situated about 45 km from Madrid.
