pistachio and cardamom layer cake 3/4 cup (110 g) at room temperature1 1/2 cups (325 g) sugar3 eggs1 1/2 cups milk1 tsp vanilla extract vanilla bean buttercream 1 1/2 cups (340 g) unsalted butter, at room temperature4 cups (550 g) icing sugar1 vanilla bean2 tbsp whipping cream