This showstopper of a chocolate dessert is all sleek planes and clean right angles, elegantly enrobed in glossy dark chocolate studded with toasted nuts. Slicing it reveals a layered interior of light, nutty meringue sandwiched with silky buttercream. The problem is that it’s also a project piece, so you rarely see it in home kitchens. Our dacquoise is not just easier than a professional-bakery version—it’s better.