Pistachio and Green Tea Polvorones with Green Tea Truffle Filling

Name: Pistachio and Green Tea Polvorones with Green Tea Truffle Filling
Ingredients: 2 cup raw,shelled,unsalted pistachios; 1/4 cup demerara sugar, ground to powder; 2 tablespoon 'white whole wheat' or spelt flour; 1 3/4 cup cornstarch; 2 tablespoon high quality green tea powder (matcha); 2 pinches kosher salt; 2 sticks unsalted butter, cut into chunks; 2 tablespoon brandy; 1/2 tablespoon vanilla; 9.6 ounce Caillebaut white chocolate, shaved/sliced small; 3 ounce heavy cream; 6 3/4 teaspoon green tea powder; 3 pinches kosher salt