More than 150 pounds of chocolate, 100 pounds of cocoa powder and 20 years of sweet experience went into “Vegan Chocolate,” the bestselling cookbook by pastry goddess Fran Costigan. With tarts and truffles, cookies and creme and shower-stoppers like Sachertorte and Costigan’s childhood favorite, Brooklyn Blackout Cake, it’s a chocolate orgy that’s absolutely plant-based. A…

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