El Diablo, Tango’s most popular dessert. Latin-inspired restaurant Tango on Capitol Hill will celebrate its 10 year anniversary next month by offering diners free El Diablo desserts on April 1, 15, and 30. Tango’s most popular dessert is a cube of dark chocolate with cayenne pepper, spicy almonds, and a tequila-caramel sauce. Did you know chocolate and cayenne pepper are considered aphrodisiacs? Make your dinner reservation now.