Blood Orange Chocolate Hazelnut Tart

1 ½ cups graham crackers 2-3 tablespoons cocoa powder ½ cup toasted hazelnuts, finely ground 2 tablespoons granulated sugar 1 tablespoon blood orange zest, optional 6 tablespoons unsalted butter, melted Chocolate Ganache 8 ounces dark chocolate, roughly chopped 1 cup heavy whipping cream 2 tablespoons blood orange juice Top With chocolate shavings crushed hazelnuts blood…