milk or soy milk • grounded black tea leaves, Ceylon tea • hot water • (1.4 oz, 3.5 Tbsp) granulated sugar • unsalted butter, room temperature • (0.7 oz, 2 Tbsp) powdered sugar • black tea flavored paste • vanilla oil, optional • (1.4 oz, 6.5 Tbsp) grounds almonds • cake flour or all-purpose flour • walnut, unsalted, roasted, finely chopped • grounded black tea leaves, Ceylon tea •