The folks behind Agricola Street Brasserie (2540 Agricola Street) and Little Oak (1475 Lower Water Street) are adding something extra to their repertoire. Just in time for patio season, the Brasserie’s upstairs patio will now be known as Billow Bar Rooftop Cocktails & BBQ, a sunny spot to drink, eat and eat some more. The 50-seater, which aims to debut this month, will boast a menu of southern barbecue inspired eats (think brisket and biscuits) courtesy of chef  Ludovic Eveno and creative ice cream sandwiches from chef  Julie Cook (like passionfruit and carrot). The wine and craft beers will be flowing, with a cocktail menu that’ll change regularly rounding out the drinkable offerings.