Dish of the Week: Cachaça-layered cookie tart with red-fruits syrup This no-doubt decadent dessert — comprised of layers of cookie and a Brazilian liquor cachaça-laced cream and red berry sauce — is one of the authentic menu items that will be featured during the Brazil, Uai! food festival being hosted by the Brazilian Embassy this week. Rumberos on 14th St. in Columbia Heights is the venue for the food festival, which is part of the…