La Sirena Clandestina in Fulton Market combines bright, coastal Brazilian fare with a dark, sexy atmosphere suitable for the date you’ve thus far struggled to impress. The chocolate-brown wooden tables are littered both with teeny glistening candles and cocktails, like the Bikini Weather (coconut, passion fruit, and tequila), which, by the way, are robust and beach party-worthy. As for food, the menu is a mix of small and large plates, unified by an emphasis on Brazilian meat and seafood tastes, like head-on prawns or ceviche. Share the tres leches for a sweet end to the evening.