This historic café in Piazza Navona has been open since the start of the 19th Century when it was an inn. In 1931 it reached the peak of its success largely thanks to a truffle-inspired confection which was invented by its manager, the secret recipe of which has been handed down ever since. The specialty is the tartufo (truffle) but there is also the usual array of coffee variations all of excellent quality. There are many tables outside which are always filled with tourists or businessmen.