Dark Chocolate Milkshake with "Fluffy" Coconut Whipped Cream

"This is my homage to what I consider to be one of the best candy bars on the planet: Fran's Gold Coconut Bar, created by Fran's Chocolates in Seattle. The bar consists of bittersweet chocolate wrapped around a creamy coconut–white chocolate ganache center. It's off-the-charts good! To achieve that contrast between the bitter dark chocolate and the sweet coconut ganache in a milkshake, I combine a double chocolate shake with a mousselike coconut whipped cream, and layer this shake like a parfait. All you need to do is dig in your straw and stir for a little bit of heaven...."