Anchored by a 150-year-old sourdough starter and a baking program shaped at Michelin-starred kitchens in Manhattan, Secret Sister runs a sourdough bakery and teahouse at 2215 30th St. The bakery supplies fresh bread and desserts to its sibling seafood restaurant, Mabel's Gone Fishing, and to The Rose Wine Bar next door. Choux-pastry breakfast sandwiches on cheddar-chive gougeres, glazed sourdough doughnuts, and laminated viennoiseries rotate through the display case based on seasonal produce availability. Morning visitors extending a South Park food walk can pair a scone with a pour-over at Communal Coffee on Fern Street. The most intricate output is the seasonal custom cake program, featuring multi-layer builds such as olive oil cake with burnt bergamot buttercream and malted vanilla cream.