At first glance, Riverdel is more or less indistinguishable from any other gourmet food shop in Brooklyn. Shelves along one side of the narrow space are lined by boxes of gluten-free pasta, artisanal chocolate bars, no-added-sugar ketchup, shakers of nutritional yeast and jars of small-batch vodka sauce. On the other side is a refrigerated display case containing what appears to be a motherlode of dairy products – jalapeño cream cheese, blocks of feta and bloomy-rinded wheels of camembert – that spill from its cool confines.