Written by DCist contributor Whitney Satin The recent opening of Co Co. Sala in Penn Quarter marks another foray into D.C.’s emerging chocolate lounge scene. The new hangout spot provides dessert enthusiasts with a sleek and comfy atmosphere where pastry chefs reign supreme as they infuse chocolate into every element of the dining experience. Beginning with the drink order – stick to the basics with one of three hot chocolates ($8, flight of white, milk,......